United States Court of Appeals
                             FOR THE EIGHTH CIRCUIT
                                    ___________

                                 Nos. 05-2124/2126
                                   ___________

United States of America,           *
                                    *
         Appellee/Cross-Appellant, * Appeal from the United States
                                    * District Court for the
      v.                            * District of Nebraska.
                                    *
Rommel Smith, also known as Ro      *
Sleezy,                             *
                                    *
         Appellant/Cross-Appellee. *
                               ___________

                              Submitted: May 17, 2006
                                 Filed: June 27, 2006
                                  ___________

Before BYE, HEANEY, and COLLOTON, Circuit Judges.
                           ___________

BYE, Circuit Judge.

       Rommel Smith appeals his conviction for conspiring to distribute and possess
with the intent to distribute 50 grams or more of cocaine base and 500 grams or more
of a mixture containing a detectible amount of cocaine and the jury determination he
is responsible for 1.5 kilograms or more of a substance containing cocaine base.
Smith argues the district court erred by improperly instructing the jury, there was
insufficient evidence to support a conviction for the conspiracy charged in the
indictment, and his counsel was ineffective. The government appeals the district
court’s sentence of 204 months of imprisonment and five years of supervised release
arguing the district court erred by not imposing an obstruction of justice enhancement,
improperly determining Smith’s criminal history category overstated his criminal
history, and conducting an improper 18 U.S.C. § 3553(a) analysis. We affirm the
conviction and remand for resentencing.


                                             I


                                            A


        Smith argues the district court erred in its instructions to the jury. The district
court, in its preliminary instructions, informed the jury the case involved a charge of
conspiracy relating to cocaine and cocaine base. Evidence was admitted and
arguments were made during trial relating to both powder cocaine and cocaine base.
In its final instructions to the jury, the district court informed the jury the conspiracy
charged by the government related to cocaine base. The final instruction did not
reference powder cocaine. Smith argues this final instruction is erroneous and
warrants reversal of his conviction because the jury was not instructed how to evaluate
the evidence introduced at trial relating to powder cocaine.


       Smith did not object to the district court’s instructions on this issue. When a
party fails to offer an instruction or does not object to an instruction provided by the
district court, we review the instruction given for plain error. United States v.
Gaona-Lopez, 

, 506 (8th Cir. 2005). Plain error is established when
there is an error that is plain which affects a defendant’s substantial rights. United
States v. Olano, 

, 732-36 (1993); United States v. Smith, 

,
997 (8th Cir. 2006). The question is “whether the ailing instruction . . . so infected the
entire trial that the resulting conviction violates due process.” Estelle v. McGuire, 

, 72 (1991) (internal quotation omitted). If the instructions, when taken as a
whole, “fairly and adequately submitted the issues in the case to the jury,” reversal of

                                           -2-
the conviction is not required. Wheeling Pittsburg Steel Corp. v. Beelman River
Terminals, Inc., 

, 711 (8th Cir. 2001). Once a defendant establishes the
existence of a plain error affecting substantial rights, we must decide “whether to
exercise our discretion to review a plain error because it ‘seriously affects the fairness,
integrity, or public reputation of judicial proceedings.’” United States v. Pirani, 

, 553 (8th Cir. 2005) (en banc) (quoting Johnson v. United States, 

, 467 (1997)).


       Evidence was received at trial regarding the conversion of powder cocaine to
cocaine base, including Smith’s involvement in such conversion. The jury also heard
evidence on the conversion rate from powder cocaine to cocaine base. Assuming,
without deciding, the instructions were plainly erroneous, the jury would have only
considered the evidence presented as it related to cocaine base. If the jury ignored all
the evidence regarding powder cocaine, it still could have attributed over four
kilograms of cocaine base to Smith and convicted Smith of the offense charged. This
evidence was also sufficient to support the drug quantities calculated by the district
court. Given these facts, we conclude Smith’s substantial rights were not affected by
the jury instruction and we find no reversible error in the instructions provided.


                                            B


      Smith next argues insufficient evidence exists to convict him of the conspiracy
charged in the indictment. He argues the government, at best, proved the existence
of multiple conspiracies, none of which were the conspiracy charged.


      To establish a drug conspiracy, the government must prove the existence of an
agreement between two or more persons to violate federal narcotics law. The
existence of an agreement is established upon a showing the defendant was aware of

                                           -3-
the purposes of the agreement and voluntarily participated in the agreement. United
States v. Hester, 

, 760 (8th Cir. 1998). We will reverse a conviction for
lack of sufficient evidence only if no reasonable juror could have concluded beyond
a reasonable doubt the government met its burden of proof as to each element of the
offense. See United States v. Bolzer, 

, 1035 (8th Cir. 2004); United
States v. Hernandez, 

, 988 (8th Cir. 2002). We review the evidence in
the light most favorable to the verdict. United States v. Lopez-Arce, 

,
782 (8th Cir. 2001).


       Where, as here, a defendant argues the evidence varies from the conspiracy
charged in the indictment by establishing multiple and different conspiracies than the
one charged, “[w]e will reverse only if we find the evidence adduced at trial does not
support a finding of a single conspiracy, and we determine [the defendant] was
prejudiced by the evidence.”1 United States v. Benford, 

, 914 (8th Cir.
2004) (internal quotation omitted). “Whether the government’s proof at trial
established only a single conspiracy or multiple conspiracies is a question of fact,
which we review for clear error.” 

omitted).


      “A single conspiracy is composed of individuals sharing common purposes or
objectives under one general agreement.” United States v. Morales, 

,
118 (8th Cir. 1997) (internal quotations omitted). “A single conspiracy may exist
even if the participants and their activities change over time, and even if many


      1
       Prejudice is established upon a showing: (1) the evidence relating to the other
conspiracies had prejudicial spillover effects as to the conspiracy charged, (2) the
indictment provided insufficient notice of what evidence would be provided against
the defendant at trial, or (3) the indictment was so vague as to risk subsequent
prosecution for the same conduct. United States v. Pizano, 

, 720 (8th
Cir. 2005). Smith only alleges prejudice resulting from the spillover effects of the
evidence.

                                         -4-
participants are unaware of, or uninvolved in, some of the transactions.” United States
v. Contreras, 

, 916 (8th Cir. 2002) (internal quotation omitted). Further,
the agreement need not be explicit, but may be tacit, based upon the actions of the
defendant. United States v. Adams, 

, 893-94 (8th Cir. 2005).


       In determining whether a single conspiracy was proven by the evidence
adduced at trial, we consider the totality of the circumstances, including “the nature
of the activities involved, the location where the alleged events of the conspiracy took
place, the identity of the conspirators involved, and the time frame in which the acts
occurred.” 

United States v. Morales, 

, 119 (8th Cir. 1997);
see also United States v. Radtke, 

, 838 (8th Cir. 2005) (holding a single
conspiracy exists when there exists one overall objective to perform various functions
to achieve the purposes of the conspiracy).


       We conclude the evidence presented at trial establishes a single conspiracy.
There is ample evidence Smith pooled his resources with other dealers, cooked
cocaine base with his co-conspirators, shared drug suppliers, acted as an intermediary
for a number of drug purchases, bought and sold cocaine base from shared contacts
on a regular basis, and received compensation for allowing drug activities to occur at
his home, all with a purpose of distributing powder cocaine and cocaine base. Under
the totality of the circumstances, the evidence establishes a single conspiracy to sell
cocaine base from a central location – Smith’s home – with changing parties; it does
not establish multiple conspiracies. See United States v. Hill, 

, 472 (8th
Cir. 2005) (holding a “hub and spokes” conspiracy establishes a single, albeit massive,
conspiracy); 

(concluding a single conspiracy was proven
when the evidence adduced at trial established a common goal among gang members
of distributing cocaine base in a particular area, despite the long period of the
conspiracy); see also United States v. Wilkinson, 

, 976 (8th Cir. 1997)
(“When a jury returns a guilty verdict on an indictment charging several acts in the

                                          -5-
conjunctive, the verdict stands if the evidence is sufficient with respect to any one of
the acts charged.”) (internal quotation omitted). Because we conclude the evidence
adduced at trial did not vary from the conspiracy charged in the indictment, we need
not address whether Smith suffered prejudice.


                                           C


       Finally, Smith argues his counsel was ineffective because he failed to object to
some of the government’s direct examination on foundational and leading grounds
and because his counsel’s cross-examination of some of the government’s witnesses
resulted in evidence supporting the conviction. In general, an ineffective assistance
of counsel claim is not cognizable on direct appeal. United States v. Hernandez, 

, 749 (8th Cir. 2002) (internal citations omitted). We review direct appeal
claims of ineffective assistance “only in exceptional cases where the district court has
developed a record on the ineffectiveness issue or where the result would otherwise
be a plain miscarriage of justice.” 

omitted). Despite Smith’s
claim to the contrary, we find no exceptional circumstances present in the instant case
to justify consideration of his ineffective assistance claim on direct appeal.
Accordingly, we affirm Smith’s conviction.


                                           II


       The district court determined Smith faced a base offense level of thirty-eight
and a criminal history category III under the now advisory Guidelines. The district
court concluded Smith’s criminal history category was overstated and determined a
criminal history category II was more appropriate. It also denied the government’s
motion for an enhancement for obstruction of justice. After these adjustments,
Smith’s adjusted offense level was thirty-eight, resulting in an advisory Guideline

                                          -6-
range of 262 to 327 months. After considering the factors under 18 U.S.C. § 3553(a),
the district court imposed a sentence of 204 months of imprisonment with five years
of supervised release. The government appeals the district court’s sentence, alleging
the district court erred by not imposing an obstruction of justice enhancement,
reducing Smith’s criminal history category, and imposing an unreasonable sentence.


       The Pre-Sentence Investigation Report (PSR) recommended application of a
two-level obstruction of justice enhancement pursuant to U.S.S.G. § 3C1.1 because
Smith’s trial testimony materially differed from and contradicted his earlier proffers
to law enforcement officials. In determining whether such an enhancement should
apply, the district court must review the evidence and find, by a preponderance of the
evidence, the defendant gave “false testimony concerning a material matter with the
willful intent to provide false testimony, rather than as a result of confusion, mistake,
or faulty memory.” United States v. Ziesman, 

, 956 (8th Cir. 2005)
(internal quotation omitted).


       The district court, pursuant to its policy to not apply enhancements not found
by a jury, denied the motion seeking application of the obstruction of justice
enhancement. The district court made no factual inquiry or analysis into whether
Smith actually obstructed justice, but instead suggested United States v. Booker, 

(2005), required the prosecution to bring a perjury charge against Smith
because the enhancement increased Smith’s maximum sentence by a factor not found
by the jury.


       Reviewing the district court’s application of the Guidelines de novo, United
States v. Mashek, 

, 1017 (8th Cir. 2005), we conclude the district court
erred in not considering whether to impose an obstruction of justice enhancement.
Booker did not change how the Guidelines are calculated. See United States v.
Washburn, 

, 1014 (8th Cir. 2006) (noting application of an obstruction

                                          -7-
of justice enhancement does not run afoul of the Sixth Amendment). In determining
the advisory Guideline sentence, the district court must rule on all applicable
Guidelines departures and adjustments. See United States v. Haack, 

,
1002-03 (8th Cir. 2005). Application of an obstruction of justice enhancement is not
discretionary if the requisite factual findings are made. See U.S.S.G. § 3C1.1.


       Here, the government properly moved for an obstruction of justice
enhancement. The district court’s refusal to consider such a motion as a result of its
application of an incorrect legal principle was erroneous and may have resulted in a
different sentence. Accordingly, we remand for resentencing and do not reach the
government’s challenge to the reasonableness of the sentence imposed.2 See 

(“If the sentence was imposed as the result of an incorrect
application of the guidelines, we will remand for resentencing as required by 18
U.S.C. § 3742(f)(1) without reaching the reasonableness of the resulting sentence in
light of § 3553(a).”).


                                         III


      For the foregoing reasons, we affirm the conviction but remand for
resentencing.
                       ______________________________




      2
        We find the government’s appeal of the district court’s reduction of Smith’s
criminal history category to be without merit. The government provided no authority
establishing the district court erred in reducing Smith’s criminal history category
under U.S.S.G. § 4A1.3. On review of the record, we cannot say the district court
abused its discretion by reducing Smith’s criminal history category. Accordingly, we
do not disturb the district court’s ruling on this issue.

                                         -8-