MIKELL, Judge.

This is a toxic tort case involving product liability, negligence, and loss of consortium claims maintained by Laura Butler, individually and as administratrix of the estate of her late husband, Walter Butler,1 against Union Carbide Corporation and 16 other companies.2 The complaint alleges that Mr. Butler developed malignant mesothelioma due to his occupational exposure to products containing asbestos manufactured or sold by the defendants.

Before he died, Mr. Butler retained Dr. John C. Maddox, a pathologist, as his expert on specific causation; that is, whether asbestos from a Union Carbide product contributed to causing Butler's mesothelioma.3 Maddox deposed that each exposure to asbestos above "background" levels, or those present in ambient air, contributed to causing the disease. A since-dismissed defendant, Reichhold, Inc., moved to strike Maddox's testimony, and Union Carbide joined the motion. After holding a hearing pursuant to Daubert v. Merrill Dow Pharmaceuticals, Inc.,4 the trial court issued an extensively researched order5 granting Union Carbide's motion. The trial court issued a separate order granting summary judgment to Union Carbide. Mrs. Butler appeals these orders. For the reasons that follow, we affirm.

Background

Mr. Butler was exposed to products containing asbestos from 1965 to 1973, when he worked at a company in Madison, then called Watertown Manufacturing, which made plastic handles for various household items. Mr. Butler was the "preforming" operator; it was his job to use a granulated, phenolic molding compound to make solid pellets of different sizes and weights. The pellets were then transferred to a press operator, who turned the pellets into plastic handles. Mr. Butler deposed that he used 50 to 100 bags of the molding compound daily; that each bag weighed 50 pounds; and that 15 to 20 times daily, he slit open the bags and poured the compound into a hopper that sat atop the preform machine, causing him to breathe in visible dust created by dumping the bags.

Mr. Butler identified Union Carbide as one of nine brands of molding compound that he recalled using on the job, although he testified that he mostly used products manufactured by Reichhold or Durez. A co-worker testified that he recalled using "bakelite," which is the trade name for Union Carbide's product. Two other co-workers testified that they did not recall ever using a compound manufactured by Union Carbide.

Dr. Dennis Paustenbach, a toxicologist, reviewed Union Carbide's sales records during the relevant years and testified that Union Carbide sold 135,100 pounds of molding compound to Watertown, comprised of 45,650 pounds of heat-resistant product containing chrysotile asbestos and 89,450 pounds of general purpose material containing two to three percent asbestos. A representative of Union Carbide, Carlos Martino, testified that the heat-resistant product contained 15 to 30 percent chrysotile asbestos. Dr. Paustenbach testified that the 135,100 pounds of Union Carbide product comprised one percent or less of the total number of pounds handled by Mr. Butler while he worked at Watertown. He also testified that the total amount of time Mr. Butler could have been exposed to the chrysotile material during his career was eight days.

A certified industrial hygienist, William M. Ewing, testified that Mr. Butler's exposure to asbestos from a Union Carbide molding compound was more than two fibers per cubic centimeter "on an eight hour time weighted average basis."6

In 2007, Dr. Maddox reviewed Mr. Butler's medical reports and concluded, to a reasonable degree of medical certainty, that his cumulative exposure to asbestos caused his mesothelioma. Dr. Maddox was deposed on August 25, 2009. When asked whether he would offer an opinion that attributed causation to any specific company's products, Dr. Maddox testified as follows: "To the extent that the patient was exposed to any of these products, they contributed in a cumulative fashion to his total asbestos dose, which is what caused his mesothelioma." Dr. Maddox concluded that each exposure to asbestos above background level is a substantial contributing factor to causing mesothelioma, although he qualified his conclusion by explaining that "amphibole types are more potent that chrysotile." According to Dr. Maddox, Mr. Butler's testimony as to dust inhalation evidenced a substantial and significant exposure to asbestos, sufficient to cause mesothelioma.

In November 2009, Union Carbide joined co-defendant Reichhold's motion to strike Dr. Maddox's testimony that Mr. Butler's disease could be attributed to its product. The trial court granted the motion with respect to Reichhold but reserved ruling as to Union Carbide and requested additional briefing. Mrs. Butler moved for reconsideration and submitted in support thereof an eight-page affidavit from Dr. Maddox, dated January 26, 2010. In the affidavit, Dr. Maddox offered, for the first time, scientific support for his opinions, specifically "the capability of chrysotile asbestos to cause mesothelioma." Dr. Maddox concluded that although the amount of Union Carbide products used at Watertown "may have been a small percentage of the overall amounts of phenolic molding compounds utilized at the facility, the amount of asbestos exposure that Mr. Butler had from this product would have been a significant contributing factor to the development of his mesothelioma and death."

The Daubert hearing was held on March 31, 2010. Dr. Maddox testified that each and every exposure to asbestos above background levels contributes to the development of mesothelioma. Dr. Maddox testified that "exposure to a genotoxic substance ... [is] considered a no-threshold exposure" and must be counted as a causative factor.

The Trial Court's Order Striking Dr. Maddox's Opinion (Appendix)

The trial court concluded that Dr. Maddox "has not properly utilized the scientific method to make scientifically valid decisions in reaching his specific causation opinion as required by Daubert."7 In reaching this conclusion, the court analyzed Dr. Maddox's testimony by applying the four noninclusive Daubert factors used in determining reliability: "(1) whether the theory or technique can be tested; (2) whether it has been subjected to peer review; (3) whether the technique has a high known or potential rate of error; and (4) whether the theory has attained general acceptance within the scientific community."8

The trial court determined that Dr. Maddox's opinion failed the first element because he relied on the theory that any exposure to the asbestos in Union Carbide's product would contribute to the development of mesothelioma, yet he testified that the theory was essentially untestable and had not been tested. The court also reasoned that Dr. Maddox's testimony failed the third element because "a nontestable hypothesis ... cannot have an error rate."9 The trial court then proceeded to consider the second element, peer review, and concluded, based on Daubert, that it was relevant but not dispositive, and far less crucial than "falsifiability"; i.e., the "testable and tested" and "error rate" elements. Concerning the fourth factor, general acceptance within the scientific community, the trial court stated that Dr. Maddox's opinion relied heavily on this factor and that any general acceptance shown for his opinion was far outweighed by its lack of scientific validity. Finally, the court found that Dr. Maddox was the "quintessential expert for hire" and, as a result, exercised its discretion "to apply the Daubert factors with greater rigor."10 Accordingly, the court ruled that Dr. Maddox's specific causation testimony "fail[ed] the Daubert test for scientific knowledge and therefore [was] not `the product of reliable principles and methods' under OCGA § 24-9-67.1(b)(2)."11

Discussion

1. Initially, we must note the distinction between general causation and specific causation. "General causation is whether a substance is capable of causing a particular injury or condition in the general population, while specific causation is whether a substance caused a particular individual's injury."12 That occupational exposure to asbestos is capable of causing mesothelioma is not in question.13 At issue in this appeal is the admissibility of expert testimony concerning whether asbestos from a Union Carbide molding compound contributed to causing Mr. Butler's mesothelioma.

"[T]he issue of the admissibility or exclusion of expert testimony rests in the broad discretion of the court, and consequently, the trial court's ruling thereon cannot be reversed absent an abuse of discretion."14 The standard for admissibility of expert testimony is governed by OCGA § 24-9-67.1(b), which provides:

As noted above, the trial court excluded Dr. Maddox's specific causation opinion by finding that it was not the product of reliable principles and methods. The court properly utilized federal authority, including Daubert, as permitted by OCGA § 24-9-67.1(f) when determining whether the expert's testimony met the requirements of OCGA § 24-9-67.1(b).15 Such authority imbues trial courts with "substantial discretion in deciding how to test an expert's reliability."16 Moreover, OCGA § 24-9-67.1(b) is based upon Rule 702 of the Federal Rules of Evidence, which places the burden of establishing the reliability of the expert's opinion on the proponent.17 Thus, Mrs. Butler was required to establish that Dr. Maddox's opinion is "the product of reliable principles and methods" pursuant to OCGA § 24-9-67.1(b)(2).

Mrs. Butler argues that the trial court manifestly abused its discretion in striking Dr. Maddox's specific causation opinion for three reasons: Dr. Maddox utilized generally accepted, reliable methodology; his opinion is based on reliable science; and his opinions are widely accepted. Mrs. Butler contends that the trial court misconstrued Dr. Maddox's testimony that each exposure to asbestos above background level contributes to causing the disease. She also asserts that the trial court misapplied the Daubert factors. For the following reasons, we discern no manifest abuse of discretion in the court's decision.

(a) Mrs. Butler's contentions that Dr. Maddox utilized generally accepted, reliable methodology and based his opinion on reliable science are premised upon his reliance upon scientific literature. The literature, however, does not support his specific causation opinion based on the evidence shown in this case.

The record shows that the phenolic molding compound supplied by Union Carbide to Watertown during the time Mr. Butler worked there comprised one percent or less of the total amount of such compound to which Mr. Butler was exposed. During his deposition, Dr. Maddox did not offer an opinion that any specific company's products caused Mr. Butler's disease but stated instead that his cumulative occupational exposure to all of the products contributed to cause the disease. At the Daubert hearing, Dr. Maddox testified that, assuming Mr. Butler's exposure to asbestos from a Union Carbide compound reached two fibers per cubic centimeter on an eight-hour, time-weighted basis, it would take "just a few weeks" to reach a cumulative exposure of 0.15 fiber years. Dr. Maddox explained that studies showed a "statistical significance" of such "low dose" exposure to asbestos. The evidence shows, however, that Mr. Butler's maximum exposure to Union Carbide's product was eight days. Moreover, although Dr. Maddox relied upon the Helsinki Criteria18 in reaching his opinion, he admitted that this report did not address whether a component of a cumulative exposure of asbestos is causative.

In addition, the evidence showed that the asbestos fibers in Union Carbide's product were chrysotile.19 One study on which Dr. Maddox relied states that the researchers "could not examine mesothelioma risk according to fiber types because our study design ... did not allow us to identify those subjects whose exposure was only to chrysotile fibers."20 In affirming a summary judgment for lack of evidence that the plaintiffs' decedent had been exposed to chrysotile asbestos in the defendant's joint compound products, the Texas Court of Appeals determined that Dr. Maddox's specific causation opinion did not raise an issue of fact as to whether the total dose of chrysotile asbestos to which the decedent was exposed exceeded a minimum dose above which mesothelioma does not occur.21 Specifically, the court found that the scientific literature upon which Dr. Maddox relied "is inconclusive regarding the effect of exposure to only chrysotile fibers"22 and "does not support a minimum threshold dose for chrysotile only exposure that would increase one's risk of developing mesothelioma."23 Although the Texas opinion did not involve a Daubert challenge, it nevertheless lends credence to the trial court's conclusion that Dr. Maddox's "no threshold" theory was scientifically unreliable.24

(b) Mrs. Butler also contends that the trial court erred by discounting the Daubert factor concerning whether Dr. Maddox's opinion had attained general acceptance within the scientific community.25 She argues that it is widely accepted by courts, in this state and elsewhere, that any exposure to asbestos above background levels contributes to causing mesothelioma.26 As noted above, however, a Texas appellate court rejected Dr. Maddox's "any exposure" theory, ruling that it failed to provide any evidence that plaintiffs' decedent's exposure to chrysotile-only asbestos products was a substantial factor in causing him to develop mesothelioma.27 In the final analysis, nothing in the record or case law precluded the trial court from exercising its discretion to weigh this factor less heavily than the other three Daubert factors. The United States Supreme Court commented in Kumho Tire Co. v. Carmichael28 that the question of "whether Daubert's specific factors are, or are not, reasonable measures of reliability in a particular case is a matter that the law grants the trial judge broad latitude to determine."29

(c) Mrs. Butler also attacks the trial court's finding that Dr. Maddox was a "quintessential expert for hire" based, in part, on "the litigation orientation he exhibited in attempting to add a proper empirical basis for his opinion after he had originally stated his sworn opinion and the Court first found that it was inadmissible."30 But there is evidence in the record to support this finding. It was not until he submitted an affidavit after his deposition that Dr. Maddox offered, for the first time, scientific support for his opinion concerning "the capability of chrysotile asbestos to cause mesothelioma." It was within the trial court's discretion "to apply the Daubert factors with greater rigor."31

(d) Mrs. Butler similarly contends that the trial court abused its gatekeeper function under Daubert by assessing Dr. Maddox's credibility. Of course, the

But this discussion applies more appropriately to warn trial courts not to "evaluate the credibility of opposing experts and the persuasiveness of competing scientific studies."33 In this case, the trial court did not weigh the testimony of conflicting expert opinions and did not determine that Dr. Maddox lacked general credibility.34 Rather, the trial court stated that "while Dr. Maddox is undoubtedly a qualified doctor, he has not properly utilized the scientific method to make scientifically valid decisions in reaching his specific causation opinion as required by Daubert."35

Mrs. Butler argues that Dr. Maddox's inability to quantify Mr. Butler's increased risk of developing the disease from his exposure to Union Carbide's product does not affect the admissibility, under Georgia law, of his opinion as to specific causation. She cites Fulmore v. CSX Transp.,36 in support of this proposition. Fulmore involved an appeal of 18 related negligence actions brought under the Federal Employers' Liability Act (FELA) by railroad employees who contracted asbestosis. The railroad argued that, absent evidence of the quantity of asbestos to which the employees were exposed while working there, plaintiffs could not show that the quantity of asbestos fibers in the air during the relevant times exceeded the then accepted threshold level of exposure value (TLV).37 Plaintiffs' expert testified that the employees' exposures to visible dust from the use of asbestos-containing products "exceeded all TLVs that have ever existed."38 Although the expert's qualifications were not challenged, the trial court concluded, without analysis, that the record did not demonstrate sufficient evidence concerning the dosage of asbestos to which plaintiffs were exposed.39 We thus held that the trial court erred by granting summary judgment to the railroad on the ground that plaintiffs failed to prove that they had been exposed to a specific minimum level of asbestos sufficient to cause asbestosis.40

In contrast with Fulmore, the dispositive issue in the present case is a challenge to the expert, and the trial court has amply supported its decision excluding the expert's opinion under OCGA § 24-9-67.1(b)(2). Fulmore, therefore, is not controlling on this issue.

Giving proper deference to the trial court's ruling, we cannot conclude that the court abused its discretion in excluding Dr. Maddox's specific causation testimony.41

2. Because we have concluded that Dr. Maddox's expert testimony on specific causation was properly excluded, the only issue remaining before us is whether the trial court erred in granting summary judgment to Union Carbide.

Summary judgment is appropriate when no genuine issues of material fact remain and the evidence, construed in the light most favorable to the nonmoving party, warrants judgment as a matter of law.42 A defendant may obtain summary judgment by showing "that there is no evidence sufficient to create a jury issue on at least one essential element of plaintiff's case."43 "We review a grant of summary judgment de novo."44

Causation is an essential element of a toxic tort case, and proof of causation in such cases "generally requires reliable expert testimony."45 Absent reliable expert testimony that exposure to a Union Carbide product contributed to the development of Mr. Butler's mesothelioma, there is insufficient evidence to create a jury issue as to causation.46

Mrs. Butler argues that her claims may survive summary judgment pursuant to Hoffman v. AC & S, Inc.47 and Blackston v. Shook & Fletcher Insulation Co.48 Those cases stand for the proposition that

There is evidence in the record that Mr. Butler was exposed to Union Carbide products at Watertown and that those products contained asbestos. Mrs. Butler argues that this evidence, combined with still admissible expert testimony, provides evidence to withstand summary judgment on the element of causation. Specifically, she argues that Dr. Maddox would be able to testify at trial concerning Mr. Butler's diagnosis of mesothelioma and the general causative relationship between the disease and exposure to asbestos. She also cites the industrial hygienist's testimony that Mr. Butler's exposure to asbestos from a Union Carbide product exceeded two fibers per cubic centimeter, which was higher than background levels.

Hoffman and Blackston are inapposite. The plaintiff in Hoffman failed to provide evidence of proximity to defendant's asbestos-containing product and thus could not prove even the basic, threshold requirement for recovery. In Blackston, the Eleventh Circuit declined to "create a judicial presumption that a plaintiff was exposed to the asbestos in a defendant's products by simply showing that he worked at a job site at a time when the defendant's asbestos-containing products were used."50 The issue in this case is specific causation, and Mrs. Butler has offered no evidence on that issue other than Dr. Maddox's testimony. Because it was properly excluded, Union Carbide is entitled to summary judgment.

Judgment affirmed.

SMITH, P.J., and DILLARD, J., concur.

APPENDIX

ORDER GRANTING DEFENDANT'S MOTION TO STRIKE CERTAIN TESTIMONY OF PLAINTIFF'S PATHOLOGIST DR. JOHN MADDOX

Whether an expert witness's opinion is viewed under the "general acceptance" test set forth in Frye v. United States,1 the Georgia "beyond the ken of the average layperson" test for normal expert opinion in Smith v. State,2 or the Georgia "reach[ing] a scientific stage of verifiable certainty" test for an expert opinion based on a novel scientific procedure or technique in Harper v. State,3 the test first enunciated in the United States Supreme Court decision of Daubert v. Merrell Dow Pharmaceuticals4 in 1993 was a watershed departure.

Twelve years after Daubert, the Georgia Legislature in 2005 passed OCGA § 24-9-67.1, which adopted the Daubert test for expert opinion testimony in civil actions in Georgia's state courts. This section, in pertinent part, provides:

Actually, the Georgia statute is an incorporation of the Federal Rules of Evidence revised in light of Daubert. The Rules, and therefore our statute, reflect that the basis of an expert's opinion can be based on a wide spectrum of fields that range from highly scientific to non-scientific. While Daubert recognized this, it set out a non-exclusive, four-part test for when the opinion of the expert is based on "scientific knowledge,"7 as follows:

Only (1) whether the theory or technique can be (and has been) tested and (3) [sic] the known or potential rate of error of a particular scientific technique "focus on scientific merit directly."9

Two important considerations can be noted from Justice Scalia's concurrence (with two Justices joining) in Kumho Tire, which states:

Concerning this first consideration, the U.S. Supreme Court reminds trial judges on their duty to not balk at performing adequately this gatekeeping function.11 "A trial court ... abuses its discretion by failing to act as a gatekeeper."12 On the second consideration, to counter the assertion that the four elements of the Daubert test are non-exclusive and that the standard is very flexible, "[c]ourts should remember Justice Scalia's warning in Kumho Tire that failure to apply the Daubert factors could itself constitute an abuse of discretion and when one or more Daubert factors do not apply, courts should say what criteria they relied upon to make their assessment."13

The Plaintiff's expert Dr. John Maddox based his opinion on differential diagnosis. As the Georgia Supreme Court in Mason v. Home Depot USA, Inc.14 points out

Thus, since the doctor expert's opinion must be based on scientifically valid decisions, the four-element Daubert test is appropriate and should be applied.16

Both the Plaintiff and the Defendant's pleadings, briefs, and letters made extensive reference to the cases in states that appear to still use the Frye test without denoting this. This diverted the Court's attention and energy from the relevant inquiry in the case.17 Still, the briefs are otherwise ably presented by exemplary counsel in the instant case. After deducting the inapplicable Frye jurisdiction citations,18 the Court finds persuasive the brief of the Defendant and grants its motion. The Court incorporates by reference the arguments made in Defendant's brief and will also make some other observations.

"The burden of laying the proper foundation for the admission of the expert testimony is on the party offering the expert, and admissibility must be shown by a preponderance of the evidence. Daubert, 509 U.S. at 592 n. 10, 113 S.Ct. 2786 (citing Bourjaily v. United States, 483 U.S. 171, 175-76, 107 S.Ct. 2775, 97 L.Ed.2d 144 (1987))."19 Therefore, the burden in this Daubert motion is on the Plaintiff, and it is a burden that the Plaintiff has not carried.

As Defendant clearly states, the pivotal controversy on this motion is whether the expert doctor's opinion properly supports specific causation20 of Mr. Butler's injuries by Defendant's product. A review of the asbestos-related cases show[s] that the great majority either pre-date Daubert or involve the application of Frye or other tests.21 In fact, the Plaintiff has presented grounds for Dr. Maddox's expert opinion that are adjusted to the former "general acceptance" test set forth in Frye supplemented by publications or "beyond the ken of the average layperson" test in Smith v. State. However, while Dr. Maddox is undoubtedly a qualified doctor, he has not properly utilized the scientific method to make scientifically valid decisions in reaching his specific causation opinion as required by Daubert.

Turning to the first element of the Daubert scientific test, Dr. Maddox's opinion squarely, inseparably relies on the theory that "any exposure" to the asbestos of Defendant's product will cause injury, also called "the linear non-threshold model for causation."22 However, Dr. Maddox testified that this "any exposure" or "non-threshold" theory is not practically testable and has not been tested.23 Therefore, it fails the first "key" element of the four-part Daubert test for scientifically valid knowledge: "whether [the theory or technique] can be (and has been) tested."

In addition to the statements that the Daubert Court made showing that this first element of the test is the crux of scientific methodology, Modern Scientific Evidence: The Law and Science of Expert Testimony24 states, in pertinent part, the following:

"The first of these considerations, which asks whether the theory or methodology has been subjected to the scientific method, is the most weighty."27 In fact, "scientists whose conviction about the ultimate conclusion of their research is so firm that they are willing to aver under oath that it is correct prior to performing the necessary validating tests could be viewed ... as lacking the objectivity that is the hallmark of the scientific method."28

"It is improper for an expert to presume that the plaintiff `must have somehow been exposed to a high enough dose to exceed the threshold (necessary to cause the illness), thereby justifying his initial diagnosis.' This is circular reasoning."30

The claim that there is no known safe level of exposure does not mean that none exists; it simply means science today has not or cannot, with current scientific expertise or relying on existing studies, determine what that level of exposure is.31 Dr. Maddox admitted that everybody has breathed some asbestos fibers. In the older members of our society, there is hardly any one who has not had even more exposure to asbestos since its use was prevalent in manufactured products, insulation, etc., for many years. Yet, the admitted extreme rarity of mesothelioma demonstrates that logically there is a threshold exposure for harm. Otherwise, the huge exposed population of people receiving low or even moderate doses would more frequently have this terrible disease. The dose-response relationship with its threshold just has not been established by adequate testing as of this date. Also, Dr. Maddox stated that there are idiopathic causes of mesothelioma. Without quantification of the dose-response and its threshold for asbestos when does one scientifically rule out this as a cause and not asbestos?32

Daubert does not permit experts to speculate about what they concede is not known by use of the scientific method. "[T]he courtroom is not the place for scientific guesswork, even of the inspired sort. Law lags science; it does not lead it."33

In an attempt to validate Dr. Maddox's practically untestable and admitted untested "any exposure" theory,34 Dr. Maddox has relied heavily upon standards promulgated by regulatory agencies.

Considering this difference, Mitchell v. Gencorp Inc.36 stated:

Apparently, even a Frye jurisdiction, New York, has held, "[S]tandards promulgated by regulatory agencies as protective measures are inadequate to demonstrated legal causation."37 Closer to home on this issue, the 11th Circuit in McClain v. Metabolife Int'l, Inc.,38 states:

The Reference Manual on Scientific Evidence explains that

The Plaintiff counted heavily on the Helsinki Criteria,40 which was developed in Finland. This trial court does not think that the Plaintiff has properly fulfilled the Helsinki Criteria.41 Moreover; the Helsinki Criteria were not formulated with compliance with the Daubert test in mind nor does it supplant it. The Helsinki Criteria seems more appropriate as authority to consider on the "general acceptance" test of Frye.42

Besides the federal court cases cited in Defendant's brief that rejected the "any exposure" or "non-threshold" theory upon which Dr. Maddox depends,43 Wills v. Amerada Hess Corp.44 and McClain v. Metabolife Int'l, Inc.,45 do so. "Occasionally, plaintiffs have attempted to sidestep difficulties involved in establishing dosage by arguing a "no-threshold" theory, i.e., that any exposure to the substance in question is capable of causing plaintiff's ailment. Courts have been reluctant to absolve plaintiffs of the burden of showing dosage on the basis of this theory. [Cit.]"46

In summary on the first, crucial element of Daubert's scientific knowledge test, Dr. Maddox's "any exposure" theory is, at most, scientifically-grounded speculation: an untested and potentially untestable hypothesis.47 Therefore, Dr. Maddox's opinion testimony fails this overarching element of the test.

Since Dr. Maddox's "any exposure" theory has not been tested, the Court will jump to the third element of the Daubert test, since it is the only other element of the test to "focus on scientific merit directly."48 "[I]n science, a nontestable hypothesis [such as Dr. Maddox's theory] cannot have an error rate."49 Moreover, error rate deals with the practical application of a tested theory so one litigation advantage of an untested hypothesis is that it has no error rate for its proponent to confront; it is just based on the "imaginings" of its proponent expert. But, "[c]ourts after all, operate in the real world" and need valid applications of the scientific method to provide the scientific knowledge to be used in the opinions of experts who will provide essential testimony to juries.50

On the second element of the Daubert test, peer review and publication, Dr. Maddox cited some in support of his opinion. The Daubert Court itself said, "Publication (which is but one element of peer review) is not a sine qua non of admissibility; it does not necessarily correlate with reliability. ... The fact of publication (or lack thereof) in a peer-reviewed journal thus will be a relevant, though not dispositive, consideration in assessing the scientific validity of a particular technique or methodology on which an opinion is premised.51

The instant Court follows this suggested path in weighing much more heavily the testable and tested element and the error rate element of the Daubert test.

Finally, this Court looks at the fourth element of the Daubert scientific test: general acceptance. Dr. Maddox's opinion relies heavily on this factor. Of course, as the instant Court pointed out earlier, the Plaintiff's expert, in its estimation, used the Frye test bolstered by publications to support his position.53 As the Daubert Court itself said on this element, "A `reliability assessment does not require, although it does permit, explicit identification of a relevant scientific community and an express determination of a particular degree of acceptance within that community.'"54

Of course, in the instant case, a tested threshold is part of the missing data, just as the missing testing is part of the unreliable method.

Actually, Georgia in 198256 had rejected the Frye "general acceptance" test long before the Daubert case in 1993.

In the instant case, the Court finds that any general acceptance shown for the Plaintiff's expert opinion is far outweighed by its lack of scientific validity. "Courts have been surprised at Daubert's tendency to lead toward exclusion of evidence when applied to fields that for too long rested on uncritical consensus rather than uncompromising empirical investigation."57

In addition to the factors enunciated by the Supreme Court, subsequent courts have recognized the so-called "fifth factor,"58 namely, "whether experts are proposing to testify about matters growing naturally and directly out of research they have conducted independent of litigation, or whether they have developed their opinions expressly for purposes of testifying."59

As pointed out by the federal Middle District of Georgia case of Bowers v. Norfolk Southern Corporation,60 "The Sixth Circuit has suggested that `if a proposed expert is a "quintessential expert for hire," then it seems well with in a trial judge's discretion to apply the Daubert factors with greater rigor.' Johnson v. Manitowoc Boom Trucks, Inc., 484 F.3d 426, 435 (6th Cir.2007)."61 For the reasons stated in Defendant's brief, the Court finds that Dr. Maddox easily qualifies as such a "quintessential expert for hire" not only for the length, frequency, and the apparent lucrativeness but also the litigation orientation he exhibited in attempting to add a proper empirical basis for his opinion after he had originally stated his sworn opinion and the Court first found that it was inadmissible. This transgressed the scientific rule that the empirical data should lead to the theory, not vice versa.62 Although no person probably enjoys seeing their testimony discounted, during his live testimony at the hearing on this motion Dr. Maddox's behavior seemed much more consistent with an advocate than a dispassionate scientist/witness.

Of course, the admissibility of Plaintiff's expert doctor's opinion on specific causation of Defendant's product in this civil litigation is the subject of the instant motion. Applying the Daubert test on this expert opinion is a very different inquiry than what is done on reviewing causation on a motion for summary judgment in Georgia; however, this was relied upon by the Plaintiff. The Defendant rebutted this well in its brief, but it should be additionally pointed out that the case63 on which Plaintiff relied predates the passage of the Daubert statute in Georgia.

On determining the proper methodology that applies in the instant case, it should be noted that Shiver v. Georgia & Florida Railnet, Inc.,64 said, "The trial court correctly identified two methods by which the plaintiff in a chemical exposure case may show specific causation in a manner that satisfies the Daubert standard: (1) `dose/response relationship' or `threshold phenomenon'; and (2) `differential diagnosis.'"65 However, the authority cited for these two methods is Hardyman v. Norfolk & Western R. Co.66 which is a carpal tunnel syndrome case that says dose-response is not the applicable method to determine specific causation for this kind of injury whereas differential diagnosis does apply. This humble trial court submits that this is a different proposition than giving two methods for specific causation for a chemical exposure case. As previously discussed, it appears that dose-response with an established threshold for when dose starts to cause harm would be necessary for a proper differential diagnosis to be done. Otherwise, the doctor does not have a scientific basis for ruling in a specific asbestos-containing product as a possible cause before he begins the process of ruling out possible causes. A proper dose-response methodology and differential diagnosis would appear not to be two mutually exclusive or alternative methods of specific causation but all part of the same overall method of specific causation in a chemical exposure case.

In conclusion, Dr. Maddox's opinion testimony fails the Daubert test for scientific knowledge and therefore is not "the product of reliable principles and methods" under OCGA § 24-9-67.1(b)(2).