United States Court of Appeals
                         For the Eighth Circuit
                     ___________________________

                             No. 16-1371
                     ___________________________

                                 Robert J. Parker

                    lllllllllllllllllllll Plaintiff - Appellant

                                         v.

                           Crete Carrier Corporation

                    lllllllllllllllllllll Defendant - Appellee

                            ------------------------------

                         American Trucking Association

                lllllllllllllllllllllAmicus on Behalf of Appellee
                                     ____________

                 Appeal from United States District Court
                  for the District of Nebraska - Lincoln
                              ____________

                         Submitted: September 21, 2016
                            Filed: October 12, 2016
                                ____________

Before LOKEN, GRUENDER, and BENTON, Circuit Judges.
                          ____________

BENTON, Circuit Judge.
      Crete Carrier Corporation required its truck drivers with Body Mass Indexes
(BMIs) of 35 or greater to get medical examinations to determine whether they had
obstructive sleep apnea. Crete ordered driver Robert J. Parker to undergo an
examination because his BMI was over 35. Parker refused. Crete stopped giving
Parker work. Parker sued Crete, alleging it violated the Americans with Disabilities
Act (ADA) by requiring the examination and discriminating on the basis of a
perceived disability. The district court1 granted summary judgment to Crete. Parker
appeals. Having jurisdiction under 28 U.S.C. § 1291, this court affirms.

                                          I.

      Crete hired Parker as an over-the-road truck driver in 2006. As a driver of a
commercial motor vehicle for a motor carrier, Parker was bound by regulations issued
by the U.S. Department of Transportation’s Federal Motor Carrier Safety
Administration (FMCSA). See 49 C.F.R. § 391.1(a). Under the regulations, drivers
must get medical examinations from FMCSA-certified examiners every two years.
49 C.F.R. §§ 391.43(a), 391.45(b)(1). Drivers cannot operate commercial motor
vehicles unless an examiner certifies them as physically qualified to do so. 49 C.F.R.
§ 391.41(a). During this examination—a “DOT physical”—the examiner measures
height and weight; takes a health history; tests vision, hearing, blood pressure, and
urine; and physically examines numerous body systems. See 49 C.F.R. § 391.43. To
receive certification, a driver must not have impairments that interfere with driving.
See 49 C.F.R. § 391.41(b).

     Two FMCSA advisory committees—the Medical Review Board (MRB) and
Motor Carrier Safety Advisory Committee (MCSAC)—have recommended that
FMCSA change its certification standards to reduce the risks from drivers who have


      1
      The Honorable Richard G. Kopf, United States District Judge for the District
of Nebraska.

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obstructive sleep apnea. Individuals with sleep apnea temporarily stop breathing
during sleep. The most common form of sleep apnea is obstructive sleep apnea,
where tissues around the upper respiratory tract relax and physically block the airway.

      In 2008, the MRB found that obstructive sleep apnea causes daytime
sleepiness, making drivers more likely to have accidents. It recommended testing
some drivers for obstructive sleep apnea. Med. Review Bd., Fed. Motor Carrier
Safety Admin., U.S. Dep’t of Transp., January 28, 2008 MRB Meeting Summary
2-11 (2008), available at https://www.fmcsa.dot.gov/sites/fmcsa.dot.gov/files/docs/
Fin_Meet_Min_Jan28_2008MRB_Meet_Revised11-24-09.pdf. In February 2012,
the MRB and MCSAC recommended that drivers with BMIs over 35 receive only
conditional DOT certification and undergo an additional examination for obstructive
sleep apnea. Motor Carrier Safety Advisory Comm. & Med. Review Bd., Fed.
Motor Carrier Safety Admin., U.S. Dep’t of Transp., MCSAC and MRB Task 11-
05 Final Report on Obstructive Sleep Apnea 1-2 (2012), available at
https://www.fmcsa.dot.gov/february-6-2012-mcsac-and-mrb-task-11-05-final-
report-obstructive-sleep-apnea-osa. They noted that obstructive sleep apnea can be
diagnosed by three methods. 

The “more comprehensive” method is in-
laboratory polysomnography, an “in-lab sleep study.” 

studies are
conducted at sleep centers, where staff put electrodes on patients’ bodies and observe
and record them while they sleep.

       The MRB has since changed its recommendations. In 2016, it recommended
sleep studies for drivers who either (1) have BMIs of 40 or above, or (2) have BMIs
of 33 or above plus additional risk factors. Med. Review Bd., Fed. Motor Carrier
Safety Admin., U.S. Dep’t of Transp., Draft Task 16-01 Discussion Notes (2016),
available at https://www.fmcsa.dot.gov/advisory-committees/mrb/draft-task-16-01-
discussion-notes-8232016. It now calls in-lab sleep studies the “preferred” method
of diagnosis. 

2010, Crete began a sleep apnea program based primarily on MRB and
MCSAC recommendations. The program required drivers at risk for obstructive sleep
apnea to undergo in-lab sleep studies. Drivers found to have obstructive sleep apnea
were placed on a treatment regimen. Crete implemented the program in stages, first
at larger terminals and then at smaller facilities. Crete added Parker’s facility in July
2013. That month, Crete told Parker that, due to his size, it was scheduling him for
an in-lab sleep study. Crete required an in-lab sleep study if either (1) the driver’s
BMI was 35 or above, or (2) the driver’s physician recommended a sleep study. At
Parker’s most recent DOT physical, his BMI was over 35.

       On July 11, 2013, Parker visited a certified physician assistant not affiliated
with Crete. Eleven days later, the PA-C wrote a prescription stating, in whole, “I do
not feel it is medically necessary for Robert to have a sleep study.” The next week,
Parker refused Crete’s required sleep study. Crete took Parker out of service. The
next day, Parker gave the PA-C’s prescription to Crete. Crete did not reinstate
Parker.

      Parker sued Crete, alleging it required a medical examination violating 42
U.S.C. § 12112(d)(4)(A), and discriminated against him because it regarded him as
having a disability, violating 42 U.S.C. § 12112(a). During discovery, Crete
submitted the report of Dr. Richard J. Schwab, an expert on sleep apnea. Parker
moved in limine to exclude his testimony under Daubert v. Merrell Dow
Pharmaceuticals, Inc., 

(1993). Parker moved for partial summary
judgment. Crete moved for summary judgment. The district court denied Parker’s
summary judgment and Daubert motions, and granted summary judgment to Crete.

                                           II.

       A district court’s decision to admit expert testimony stands unless it abused its
discretion. Russell v. Whirlpool Corp., 

, 455 (8th Cir. 2012). Federal
Rule of Evidence 702 states:

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      A witness who is qualified as an expert by knowledge, skill, experience,
      training, or education may testify in the form of an opinion or otherwise
      if: (a) the expert’s scientific, technical, or other specialized knowledge
      will help the trier of fact to understand the evidence or to determine a
      fact in issue; (b) the testimony is based on sufficient facts or data; (c) the
      testimony is the product of reliable principles and methods; and (d) the
      expert has reliably applied the principles and methods to the facts of the
      case.

Fed. R. Evid. 702. The district court found that the report met Rule 702’s standards
because of Dr. Schwab’s “specialized knowledge in the field of obesity and
obstructive sleep apnea, his creation and review of a significant amount of
peer-reviewed scientific literature, his extensive training in the field, and his
observations in reading 700 sleep studies annually.” The district court then relied on
Dr. Schwab’s report for: the danger posed by drivers with obstructive sleep apnea,
the usefulness of obesity and specific BMIs in screening drivers for sleep studies, the
validity of sleep studies for diagnosing obstructive sleep apnea, and the availability
of treatment for obstructive sleep apnea.

       Parker argues that Dr. Schwab lacked sufficient data to diagnose him. He also
contends that Dr. Schwab’s opinion was unreliable because Dr. Schwab said a sleep
study is needed to confirm or refute an obstructive sleep apnea diagnosis and Dr.
Schwab did not conduct a sleep study of Parker. These arguments misunderstand Dr.
Schwab’s report. He stated that because Parker had four risk factors for obstructive
sleep apnea (hypertension, snoring, obesity, and polycythemia), he likely had the
condition. Parker does not support his claims that this statement was unreliable. In
any event, the district court did not rely on that part of Dr. Schwab’s report in
granting summary judgment. Parker does cite articles that he claims “have challenged
the reliability of” Dr. Schwab’s methodology. These articles, Parker says, differ from
Dr. Schwab’s report on questions of the prevalence of obstructive sleep apnea and the
reliability of BMI as a sleep apnea predictor. Even accepting Parker’s
characterization of these articles, they do not suggest the district court abused its


                                           -5-
discretion. The fact that others might disagree with Dr. Schwab does not mean his
opinions are inadmissible under Rule 702. “[I]t is not the province of the court to
choose between the competing theories when both are supported by reliable scientific
evidence.” Kuhn v. Wyeth, Inc., 

, 633 (8th Cir. 2012). Because Parker
does not show an abuse of discretion, the district court properly denied Parker’s
motion.

                                          III.

       A grant of summary judgment is reviewed de novo. Torgerson v. City of
Rochester, 

, 1042 (8th Cir. 2011) (en banc). Crete is entitled to
summary judgment if, viewing the facts most favorably to Parker, there is no genuine
issue of material fact. See 

ADA prohibits employers from “requir[ing] a medical examination . . .
unless such examination . . . is shown to be job-related and consistent with business
necessity.” 42 U.S.C. § 12112(d)(4)(A). When an employer requires a medical exam
of its employees, the employer has the burden of showing that the exam is job-related
and that “the asserted ‘business necessity’ is vital to the business and the request for
a medical examination or inquiry is no broader or more intrusive than necessary.”
Thomas v. Corwin, 

, 527 (8th Cir. 2007). “[C]ourts will readily find a
business necessity if an employer can demonstrate . . . a medical examination or
inquiry is necessary to determine . . . whether the employee can perform job-related
duties when the employer can identify legitimate, non-discriminatory reasons to doubt
the employee’s capacity to perform his or her duties.” 

v. N.Y.
State Dep’t of Corr. Servs., 

, 98 (2d Cir. 2003) (alterations in original).
“The examination or inquiry need not be the only way to achieve a business necessity,
but it must be a reasonably effective method to achieve the employer’s goals.” 

to Parker, Crete failed to consider his individual characteristics
before mandating the sleep study. But the text of § 12112(d)(4)(A) does not require
employers to consider each employee’s unique characteristics before requiring a
medical exam. Neither does the statutory context. To the contrary, exams of all new
employees are permitted under certain circumstances. See 42 U.S.C. § 12112(d)(3).
The ADA permits employers to require a class of employees to get medical exams.
See 

.

        When an employer requires a class of employees to submit to a medical exam,
it also “must show that it has reasons consistent with business necessity for defining
the class in the way that it has.” 

. An employer satisfies this
burden by showing a “reasonable basis for concluding” that the class poses a genuine
safety risk and the exam requirement allows the employer to decrease that risk
effectively. See 

may include some individuals who testing reveals do not
pose a safety risk. And it may exclude others who testing would reveal do pose a
safety risk. All that is required is that “the employer has defined the class of
employees reasonably.” See 

a class of employees—drivers with BMIs of 35 or above—to
submit to an in-lab sleep study, a medical exam. Crete established the following
facts: Untreated obstructive sleep apnea tends to impair driving skills, increasing the
risk of motor vehicle accidents by 1.2- to 4.9-fold. A sleep study is the only way to
confirm or rule out an obstructive sleep apnea diagnosis. An in-lab sleep study is the
gold standard for diagnosing obstructive sleep apnea. Obesity is the primary
anatomic risk factor for obstructive sleep apnea. A BMI of approximately 33 is the
optimal cut-off to identify subjects likely to have obstructive sleep apnea. Screening
with a BMI above 33 has a sensitivity of 76.9% (meaning 76.9% of people with
obstructive sleep apnea have a BMI above 33) and a specificity of 70.5% (meaning
70.5% of people who do not have the condition do not have a BMI above 33).
Obstructive sleep apnea can be treated, decreasing the risk of motor vehicle accidents.


                                         -7-
Parker has offered no evidence contrary to these facts, nor anything that would lead
a reasonable factfinder to doubt them.

       By the undisputed facts, the sleep study requirement is job-related because it
deals with a condition that impairs drivers’ abilities to operate their vehicles. It is
consistent with business necessity: An examination is necessary to determine
whether an individual has obstructive sleep apnea, a condition that poses a public
safety hazard by increasing the risk of motor vehicle accidents. See 

. And Crete had reasons to suspect that Parker had sleep apnea, given his
BMI. The in-lab sleep study is no broader or more intrusive than necessary because
an examination is needed to diagnose obstructive sleep apnea and an in-lab sleep
study is the best way to diagnose it. Crete was reasonable to define the class as
drivers with BMIs of 35 or above because (1) it has a reasonable basis for concluding
that class poses a safety risk given the correlation between high BMIs and obstructive
sleep apnea, and (2) the sleep study requirement allows Crete to decrease the risk
posed by that class by ensuring that drivers with sleep apnea get treatment.

       Parker argues that even if Crete could require some class to undergo sleep
studies, it violated the ADA by including him in it. He claims that four characteristics
make his inclusion unreasonable. First, he had no documented sleep issues at work.
Second, he received a DOT certification. Third, he was awarded in 2012 for five
years of accident-free driving, and named a top trainer. Fourth, his personal medical
provider did not feel a sleep study was medically necessary. He concludes that these
characteristics removed him from any class that Crete could validly require to
undergo a sleep study. Parker essentially asserts that Crete defined the class
unreasonably: Rather than defining the class as “drivers with BMIs of 35 or above,”
it should have defined the class as “drivers with BMIs of 35 or above unless they
have (1) no documented sleep issues, (2) DOT certification, (3) accident-free and top-
trainer awards, and (4) prescriptions from medical providers who believe sleep
studies not necessary for them.” But the characteristics that Parker points to do not
undermine Crete’s reasonable basis for concluding he poses a genuine safety risk.

                                          -8-
None of the characteristics establish that he does not suffer from sleep apnea. Crete
carries its burden of showing it defined the class reasonably. The district court
correctly granted Crete summary judgment on Parker’s medical-examination claim.

                                          B.

       The ADA prohibits employers from discriminating against employees
“regarded as having . . . an impairment.” See 42 U.S.C. §§ 12102(1)(C), 12112(a).
A plaintiff alleging regarded-as discrimination may make out a prima facie case using
the McDonnell Douglas burden-shifting framework. See Norman v. Union Pac. R.R.
Co., 

, 459 (8th Cir. 2010). Parker must first show (1) Crete regarded
him as having a disability, (2) he had the qualifications to perform the essential
functions of his position with or without reasonable accommodation, and (3) Crete
took an adverse action due do his perceived disability. See 

succeeds in
establishing a prima facie case, the burden shifts to Crete to proffer a legitimate,
nondiscriminatory reason for the adverse action. See Kratzer v. Rockwell Collins,
Inc., 

, 1044 (8th Cir. 2005). If Crete makes such a proffer, the burden
shifts back to Parker to show that Crete’s stated reason is a pretext. See 

that Crete regarded him as having obstructive sleep apnea, an
impairment. The district court assumed without deciding that Parker satisfied the first
three parts of his prima facie case. The burden then shifts to Crete. Crete carries its
burden. It says it suspended Parker because he refused a sleep study. That
requirement, for the reasons discussed, is legitimate and non-discriminatory. The
burden shifts back to Parker to show Crete’s stated reason is pretext. Parker does not
make such a showing. In fact, Parker says on appeal that Crete’s stated reason is its
genuine reason: “[Crete] did not have any cause, other than to retaliate against
[Parker] for asserting his rights under the ADAAA to refuse to participate in an
unlawful medical examination, to discontinue providing [him] work.” Parker is right
that the only conceivable reason that Crete suspended him is that he failed to comply
with Crete’s sleep-study requirement. But, as discussed, Parker is wrong that the

                                         -9-
sleep study requirement was unlawful. The undisputed evidence shows that Crete
suspended Parker for refusing to submit to a lawful medical examination. That does
not violate the ADA. Since Crete’s stated reason for suspending him was not pretext,
Parker’s claim fails.

                                   *******

      The judgment of the district court is affirmed.
                     ______________________________




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