A federal grand jury indicted Pamela Clarke (Clarke) on five federal drug charges related to manufacturing and distribution of methamphetamine. Before trial, the district court 1 denied Clarke’s *952 motion to suppress evidence obtained during police searches of Clarke’s residence. At trial, the district court allowed the government to cross examine Clarke regarding Clarke’s methamphetamine use and pseudoephedrine purchases, and denied Clarke’s motion for judgment of acquittal. A jury found Clarke guilty on four of the five charges. At sentencing, the district court overruled Clarke’s objection to the amount of methamphetamine involved in the crimes, and sentenced Clarke to 63 months imprisonment. Clarke now challenges the district court’s rulings and her sentence. We affirm.
I. BACKGROUND
On August 23, 2005, Officer Timothy Groat (Officer Groat) of the Jefferson County, Missouri, Sheriffs Office received an anonymous tip that methamphetamine was being manufactured at Clarke’s home. Officer Groat responded to the tip with several other officers, and upon arrival, the officers smelled a chemical odor around the home which they recognized as consistent with methamphetamine manufacturing. The officers attempted to reach someone in the house by knocking on the door and calling the telephone number listed for the address. After no response, the officers decided to enter the home to ensure the safety of anyone possibly inside. The officers donned air purifying respirators as a precaution to possible methamphetamine manufacturing fumes, and forcibly entered the home.
When the officers entered Clarke’s home, they saw Clarke lying on the floor. The officers removed Clarke from the home to ensure Clarke’s safety. The officers called the fire department and searched the residence looking for other people inside the home. The fire department responded and ventilated the home. Clarke then gave Officer Groat oral and written consent to search the home. The officers’ search of Clarke’s residence and a nearby shed revealed items typically used to manufacture methamphetamine, including pseudoephedrine pills. The officers arrested Clarke, and after being Mirandized, 2 Clarke stated the officers should only find pill binder in her home. Clarke also disclosed she received some pills from a man named Clark and had broken the pills down the day before.
On September 7, 2006, Officer Groat again received information of methamphetamine manufacturing at Clarke’s home. Officer Groat responded with several officers, knocked on Clarke’s door, and identified himself as with the Sheriffs Office. Clarke answered, opened the door, and gave Officer Groat consent to search the premises. After two other people exited the house, the officers searched Clarke’s home and found several items associated with methamphetamine manufacturing. The officers’ search of the shed next to Clarke’s home revealed a mason jar containing a biphase liquid consistent with methamphetamine production. Officer Groat took three samples of the biphase liquid. Clarke was arrested and Mirandized. Clarke told Officer Groat the bi-phase liquid belonged to her neighbor, who cooked methamphetamine. The samples subsequently tested positive for containing methamphetamine.
A federal grand jury indicted Clarke on five counts, including: (1) conspiracy to *953 possess pseudoephedrine knowing it would be used to manufacture methamphetamine, in violation of 21 U.S.C. §§ 841(c) and 846; (2) possession of pseudoephedrine knowing it would be used to manufacture methamphetamine, in violation of 21 U.S.C. § 841(c); (3) conspiracy to manufacture fifty or more grams of a mixture or substance containing methamphetamine, in violation of 21 U.S.C. §§ 841(a), 841(b)(l)(B)(viii), and 846; (4) possession with intent to distribute fifty or more grams of a mixture or substance containing methamphetamine, in violation of 21 U.S.C. §§ 841(a)(1) and 841(b)(l)(B)(viii) and 18 U.S.C. § 2; and (5) maintaining a drug involved premises, in violation of 21 U.S.C. § 856(a)(2).
Before trial, Clarke moved to suppress (1) the evidence obtained during the two searches of Clarke’s home, and (2) Clarke’s statements to Officer Groat. The district court referred the motion to the magistrate who issued a report and recommendation to deny Clarke’s motion. The magistrate found probable cause and exigent circumstances allowed the officers to make the initial warrantless entry of Clarke’s home on August 23, 2005, and Clarke gave valid consent to the searches on August 23, 2005, and September 7, 2006. The magistrate also found Clarke’s statements were admissible because Clarke voluntarily waived her Miranda rights, and the officers had probable cause to arrest Clarke on both occasions. The district court adopted the magistrate’s report and recommendations and denied Clarke’s motion to suppress.
Clarke’s trial began on May 12, 2008. During the government’s case-in-chief, the parties jointly stipulated the three samples of biphase liquid seized by Officer Groat on September 7, 2006, weighed a total of 62.46 grams and contained methamphetamine. At the close of the government’s evidence, Clarke made a general motion, without argument, for judgment of acquittal. 3 The district court denied the motion, stating there was sufficient evidence to submit all five counts to the jury. Clarke then presented her evidence and testified. During the government’s cross examination of Clarke, the government questioned Clarke about Clarke’s prior methamphetamine use, Clarke testing positive for methamphetamine on two separate occasions after her arrest and before trial, and Clarke’s pseudoephedrine purchases after the September 7, 2006 search of Clarke’s home. Clarke’s counsel objected to the questioning on Clarke’s prior methamphetamine use and Clarke’s pseudoephedrine purchases. The district court overruled the objections. At the close of evidence, Clarke renewed, without argument, her motion for judgment of acquittal. The district court again denied the motion. The jury acquitted Clarke on count one of the indictment, but found Clarke guilty on counts two, three, four, and five.
After the jury verdict, a presentence investigation report (PSR), prepared for Clarke, calculated an advisory United States Sentencing Guidelines (U.S.S.G. or Guidelines) range of 63 to 78 months imprisonment. In the PSR, the 62.46 grams of biphase liquid containing methamphetamine stipulated to at trial was used to calculate an offense level of 26 for Clarke. Clarke’s counsel objected to using the full amount of the biphase liquid to determine Clarke’s offense level, arguing the biphase liquid was waste water which could not be counted as a “mixture or substance” under 18 U.S.C. § 841(b) or U.S.S.G. § 2D1.1. The district court overruled Clarke’s objection, adopted the PSR calculation for *954 Clarke’s advisory Guidelines range, and sentenced Clarke to the bottom of the range, 63 months imprisonment. This appeal follows.
II. DISCUSSION
A. Motion for Judgment of Acquittal
Clarke first argues the district court erred in denying her motion for judgment of acquittal because the government did not prove Clarke “possessed more than 50 grams of a mixture [or] substance containing methamphetamine.” In support of her argument, Clarke urges us to adopt a “market approach” used by some other Circuit Courts of Appeals which only attributes to the defendant the “usable or ingestible” methamphetamine contained in a mixture or substance, rather than the entire amount of any liquid containing methamphetamine. Clarke contends there was insufficient evidence to submit counts three and four to the jury because the biphase liquid was waste water which was not usable, marketable, or traffickable, and the government failed to prove the actual amount of methamphetamine in the bi-phase liquid. 4
We review de novo a district court’s denial of a motion for judgment of acquittal.
United States v. Reddest,
Under 21 U.S.C. § 841(a)(1), a person cannot “manufacture, distribute, or dispense, or possess with intent to manufacture, distribute, or dispense, a controlled substance.” Any defendant convicted under § 841(a)(1) is subject to a mandatory minimum five-year prison sentence under 21 U.S.C. § 841(b)(l)(B)(viii) if the crime involved “50 grams or more of a mixture or substance containing a detectable amount of methamphetamine, its salts, isomers, or salts of its isomers.”
In
United States v. Kuenstler,
The district court did not commit a “plain miscarriage of justice” in denying Clarke’s motion for judgment of acquittal. Clarke stipulated that the biphase liquid collected by Officer Groat weighed over fifty grams, specifically 62.46 grams, and contained methamphetamine. The government’s expert witness also testified that liquids like the biphase liquid found at Clarke’s house can be converted to usable form, and are commonly trafficked or stored for future use in methamphetamine manufacturing. Based on these facts, the entire weight of the biphase liquid justly is attributed to Clarke, and the evidence was sufficient for a reasonable jury to conclude Clarke possessed “50 grams or more of a mixture or substance containing a detectable amount of methamphetamine.” See 21 U.S.C. § 841(b)(l)(B)(viii).
B. Objection at Sentencing
Clarke also argues the district court erred in overruling her objection to using the full amount of the biphase liquid to determine her sentence. Relying on her argument that only the “usable or ingestible” methamphetamine in the biphase liquid could be attributed to her, Clarke maintains the district court improperly used the full amount of the biphase liquid to apply the five year mandatory minimum of 21 U.S.C. § 841(b)(1)(B) and to calculate Clarke’s base offense level for Clarke’s advisory Guidelines range.
“We review a district court’s interpretation of a sentence-enhancement statute de novo.”
United States v. Speakman,
The district court provided two reasons for overruling Clarke’s objection to using the full amount of the biphase liquid to determine Clarke’s sentence. The district court first noted the jury was instructed, in order to find Clarke guilty on counts three and four, the jury must find the counts involved fifty or more grams of a mixture or substance containing methamphetamine. Because the jury found Clarke guilty on these counts, the district court declined to speculate on, or second guess, the jury’s findings, and opined it was not Congress’s intent to have the district court make an independent finding at sentencing regarding the amount of pure methamphetamine in a mixture or sub *956 stance. Second, the district court followed this court’s decision in Kuenstler instead of decisions from other Circuit Courts of Appeals cited by Clarke.
The district court did not commit error in finding the five-year mandatory minimum sentence applied to Clarke because the entire weight of the biphase liquid was properly attributed to Clarke under 21 U.S.C. § 841(b)(1)(B). See Gentry, 555 F.3d at 666; Kuenstler, 325 F.3d at 1023.
The district court also did not err in applying the entire weight of the biphase liquid to determine Clarke’s advisory Guidelines range. Under U.S.S.G. § 2D.1.1(c)(7), a base offense level of 26 is assigned to a drug crime involving between fifty and two hundred grams of methamphetamine. Note B to U.S.S.G. § 2Dl.l(c) states, “In the case of a mixture or substance containing ... methamphetamine, use the offense level determined by the entire weight of the mixture or substance.” Application Note 1 to U.S.S.G. § 2D1.1 declares a mixture or substance “has the same meaning as in 21 U.S.C. § 841,” but “does not include materials that must be separated from the controlled substance before the controlled substance can be used ... [such as] waste water from an illicit laboratory used to manufacture a controlled substance.” 6
Although
Kuenstler
and
Gentry
control the amount of the biphase liquid attributed to Clarke under 21 U.S.C. § 841, these cases did not address the definition of “mixture or substance” under U.S.S.G. § 2D1.1 as applied to mixtures or substances containing methamphetamine, nor has another decision of this court addressed the issue.
See Gentry,
C. Cross Examination of Clarke
Clarke next asserts the district court erred when the district court allowed the government to cross examine Clarke regarding her pseudoephedrine purchases and positive drug tests. Clarke maintains the evidence was improper under Fed. R.Evid. 404(b) because (1) the government failed to give notice of its intent to rely on this evidence; (2) the evidence only showed Clarke’s propensity to use and manufacture methamphetamine; (3) the evidence lacked reliability; and (4) the district court gave no limiting instruction.
*957
We review a district court’s evidentiary rulings under Fed.R.Evid. 404(b) for abuse of discretion.
See United States v. Hawkins,
Clarke did not argue to the district court that evidence of Clarke’s pseudoephedrine purchases was improper under Rule 404(b), and although Clarke objected to a question by the government on her prior methamphetamine use, Clarke did not object to the government’s questions regarding Clarke’s positive drug tests. Thus, we review these rulings for plain error, which requires Clarke “to prove that there was (1) error, (2) that was plain, and (3) that affected substantial rights.”
United States v. Eagle,
Fed.R.Evid. 404(b) excludes evidence of “crimes, wrongs, or acts” which are offered to show a defendant’s propensity, or character, to commit a crime, but does not exclude the evidence “for other purposes, such as proof of motive, opportunity, intent, preparation, plan, knowledge, identity, or absence of mistake or accident.” In criminal cases, Rule 404(b) requires the prosecution to give pretrial notice, unless the district court excuses the notice at trial, regarding the “general nature” of any Rule 404(b) evidence the government “intends to introduce at trial.”
The district court found the government’s questioning on Clarke’s pseudoephedrine purchases was admissible as both impeachment evidence and proof of the charged conspiracy in count one of the indictment. This was not error. We have consistently held “ ‘crimes or acts which are “inextricably intertwined” with the charged crime are not extrinsic and Rule 404(b) does not apply.’ ”
United States v. Aldridge,
The district court also did not commit error under Rule 404(b) by allowing the government to cross examine Clarke regarding her positive metham *958 phetamine tests because the questions were not subject to Rule 404(b), but rather, were offered to impeach, under Fed. R.Evid. 608(b), Clarke’s testimony denying methamphetamine manufacturing, possession, and use. Under Fed.R.Evid. 608(b), a witness may be cross examined regarding specific incidents and actions which attack or support the witness’s character for truthfulness, but these acts cannot be proved by extrinsic evidence.
During direct examination, Clarke testified she did not recognize some of the items seized at her house which had been identified by the government as commonly used for methamphetamine manufacturing. Clarke also testified, during 2005 and 2006, she did not engage in methamphetamine manufacturing, breaking down of pills, mixing combustible substances, or possessing diet pills and cold pills to manufacture methamphetamine. On cross examination, Clarke testified she previously had used methamphetamine, but did not use methamphetamine in 2005 and 2006. Clarke also testified she inadvertently took diet pills, after she was indicted, which had been laced with methamphetamine. Because Clarke denied any connection to methamphetamine manufacturing, possession, or use, the government could attempt to impeach Clarke with questions regarding Clarke’s positive methamphetamine tests. The positive tests contradicted Clarke’s denials about methamphetamine possession and use and attacked Clarke’s truthfulness, and the government did not offer extrinsic evidence of the positive tests. Thus, the evidence was proper under Rule 608(b), and the district court did not commit any error.
Lastly, because Rule 404(b) evidence was not involved, a limiting instruction was not necessary.
D. Denial of Motion to Suppress
Clarke finally contends the district court erred in denying her motion to suppress the evidence obtained during the August 23, 2005 search of Clarke’s home. 7 Clarke argues the warrantless search was unlawful because the search did not fall within the exigent circumstances exception to the warrant requirement. Clarke asserts the general anonymous tip regarding methamphetamine manufacturing and the general smell of an odor associated with methamphetamine manufacturing did not create an exigent circumstance which authorized the officers to make a warrantless entry into Clarke’s home. Clarke maintains, because exigent circumstances did not exist for the initial entry into Clarke’s home, Clarke’s consent to the subsequent search and the evidence obtained during the search were tainted, and should have been excluded.
We review “ ‘the district court’s factual determinations in support of its denial of a motion to suppress for clear error and its legal conclusions de novo.’ ”
United States v. Hogan,
The Fourth Amendment prohibits a warrantless entry of a home by
*959
law enforcement officers unless the circumstances are within a reasonableness exception to the warrant requirement.
Castellanos,
In this case, the officers had probable cause to believe methamphetamine was being manufactured in Clarke’s home. The officers received an anonymous tip that methamphetamine manufacturing was occurring. Upon arrival, Officer Groat smelled an odor which, based on his training and extensive experience, he recognized as consistent with methamphetamine manufacturing. These facts support a determination of probable cause.
See Kleinholz,
Exigent circumstances also existed. Because the officers had probable cause to believe methamphetamine was being produced in Clarke’s home, the officers reasonably concluded there was a potential threat to the safety of the officers, anybody inside the home, and anyone in the surrounding area.
See United States v. Walsh,
III. CONCLUSION
We affirm Clarke’s sentence and the district court’s judgment.
Notes
. The Honorable Stephen N. Limbaugh, Sr., United States District Judge for the Eastern *952 District of Missouri, now retired, adopting the report and recommendations of the Honorable Frederick R. Buckles, United States Magistrate Judge for the Eastern District of Missouri.
.
Miranda v. Arizona,
. Clarke specifically moved "as a matter of law that the case is insufficient to submit to the jury.” The district court converted the motion to one for judgment of acquittal.
. Although Clarke does not specifically state in her brief which counts she believes had insufficient evidence for conviction, we assume Clarke is only challenging the district court’s denial of her motion for judgment of acquittal on counts three and four because these are the only counts which required the government to prove the existence of fifty or more grams of a mixture or substance containing a detectable amount of methamphetamine.
. Clarke frames our inquiry as a question of sufficiency of the evidence. There is no distinction between our review of the sufficiency of the evidence and the denial of a motion for judgment of acquittal.
See Reddest,
. In the district court, Clarke mentioned Application Note 1 to U.S.S.G. § 2D1.1 in her objections to the PSR, but neither party addresses in their appeal briefs the possible link between Kuenstler and Gently and Application Note 1. We choose to raise and discuss the issue only briefly.
. Clarke has not appealed the district court’s findings regarding Clarke's consent after the initial entry on August 23, 2005, and has also not appealed the district court's denial of Clarke's motion to suppress the evidence obtained during the September 7, 2006 search.
