Gregory Hill and Pamela Kuenstler were each convicted of two charges related to manufacturing methamphetamine in an amount of fifty grams or more: one count of conspiracy to manufacture a mixture and substance of methamphetamine and another charging attempt to manufacture the same, in violation of 21 U.S.C. §§ 841(a)(1), 841(b)(1)(B), and 846. Hill was also convicted of possession of methamphetamine with intent to distribute, in violation of 21 U.S.C. §§ 841(a)(1) and 841(b)(1)(C). The district court sentenced Hill to 360 months and Kuenstler to 68 months. Hill and Kuenstler appeal, and we affirm.
I.
In May 2001 authorities uncovered a methamphetamine lab in the attic of a house in which Hill and Kuenstler were staying. The lab contained equipment and precursor chemicals used to manufacture methamphetamine, as well as substances which contained methamphetamine (0.53 grams of solid material and 91.9 grams of liquid). Hill and Kuenstler were tied to manufacturing efforts at the lab by the testimony of Brenda Brown, the lessee of the house and a coconspirator. Brown was attempting to learn how to produce methamphetamine, and she testified that there had been several methamphetamine “cooks” at the lab. Hill and a friend of his had purchased the initial equipment to set up the lab and had supplied many of the precursor chemicals used in the cooks, such as рseudoephedrine, acetone, and mu-riatic acid. Hill had also helped with the manufacturing process by shaking solutions to break down ephedrine. Kuenstler had washed lab equipment in a manner designed to remove contaminants and had purchased tincture of iodine, another precursor chemical. Hill and Kuenstler had also helped Brown move the lab from a downstairs bedroom to the attic, and they each received а share of the methamphetamine produced.
Shortly before the lab was discovered, officers with an arrest warrant for Hill had arrested him in the vicinity of the house. On the front seat of his truck they found a small tin box which held a number of small plastic baggies, five of which contained a white powder substance later determined to be methamphetamine, and a small pink straw with powder residue in it. Elsewhere in the truck were a hypodermic needle, several other plastic baggies, and a sheet of paper with notations which appeared to be coded records of drug transactions.
A grand jury indicted Hill, Kuenstler, and Brown for conspiracy to manufacture and for attempt to manufacture a mixture and substance of methamphetamine in an amount of fifty grams or more. The indictment also charged Hill individually *1019 with possession of methamphetamine with intent to distribute; this count was based on the evidence found in his truck. Brown reached a plea agreement with the government, and Hill and Kuenstler proceeded to trial.
On the eve of trial Hill and Kuenstler moved to suppress evidence about the lab and its contents on the ground that it had been discovered by an unconstitutional search. The district court held an eviden-tiary hearing just before trial and denied the motion. In its oral ruling the district court found that although officers had entered Brown’s rеsidence without asking for consent, the defendants had no reasonable expectation of privacy in the attic because it was being used solely for commercial purposes.
The district court submitted the conspiracy and attempt charges to the jury with instructions that the defendants could not be convicted of either offense unless the jurors found it “involved the manufacture of fifty grams or more of a mixture and substance of methamрhetamine.” Defendants objected and argued that the indictment and the statute required proof that the object of the conspiracy or attempt was to produce fifty or more grams of methamphetamine. The objection was overruled, and the government argued in closing .that the quantity charged in the indictment had been established by evidence that the liquid substances in the lab weighed over ninety grams. Hill and Kuenstler were convicted on аll counts. Hill had prior convictions, including one for selling methamphetamine, and was sentenced as a career offender to 360 months; Kuenstler had no prior record and was sentenced to 63 months. They appeal on several grounds.
II.
Appellants claim that the district court erred by not suppressing the evidence found in the attic and by not requiring proof that the object of the conspiracy and attempt offenses was the production of fifty grams or more. They also contend that the liquid solutions in the lab were not mixtures or substances of methamphetamine within the meaning of the statute because they were unusable and unmarketable. Each raises individual claims as well. We address the arguments in turn.
Appellants claim first that their Fourth Amendment rights were violated by introduction of evidence connected with the methamphetamine lab because it resulted from an illegal search. The lab had been discovered after law enforcement officers, who had a felony arrest warrant for Hill, learned that he was staying with Brown. While waiting for a search warrant to be obtained, they proceeded to the vicinity of Brown’s house in the hope of apprehending Hill if they saw him outside. When Hill came out of the house, they attempted to arrest him as he neared his pickup truck. He tried to get away, but two officers jumped into thе back of the truck and it stalled after traveling a short distance. As Hill surrendered, a woman ran out of the house toward the officers, screaming “If you are going to kill him, you are going to have to kill me, too.” She too was placed under arrest, and officers observed that another woman was standing in the doorway of the house. They feared that they might be attacked by someone still in the house, and two of them went up to the door and asked whеther anyone else was inside. Brown was the woman at the door, and she indicated that her friend Pamela Kuenstler was also there. The officers then went into the house and looked around to ensure that no one else presented a threat. One observed that a set of stairs had been lowered from the attic, and he went up and discovered the lab. An officer told Brown that they had seen the lab in the attic and would get *1020 a warrant if she did nоt want to consent to a search. Brown signed a consent form, and the contents of the lab were seized during the subsequent search.
After its evidentiary hearing, the district court found that Brown had not consented to the original search and concluded that the search had not been justified by exigent circumstances. It denied the motion to suppress evidence of the methamphetamine lab, however, because it concluded that neither Hill nor Kuenstler had a legitimate expectation of privacy in the attic and therefore no right to challenge the constitutionality of the searches. Hill and Kuenstler argue on their appeal that they were overnight guests who had a legitimate expectation of privacy in the entire house. The government responds that appellants forfeited any legitimate expectation of privacy in the house by using it for a commеrcial purpose, that Brown had consented to both searches, and that the first search was justified by exigent circumstances.
The Fourth Amendment protects “against unreasonable searches and seizures,” but its protections are personal and cannot be asserted by persons lacking a “legitimate expectation of privacy” in the place searched.
Rakas v. Illinois,
In
Carter
the Court distinguished an “overnight social guest” from someone “merely present with the consent оf the householder” with no enforceable Fourth Amendment right in the premises.
Id.
at 90,
The Court’s analysis in
Carter
demonstrates that whether an individual has a legitimate expectation of privacy depends upon an examination of all the facts related to the claimant’s presence at the site of a search.
See also United States v. Gamez-Orduno,
We turn instead to the validity of the search. Warrantless searches are presumptively unreasonable absent some exception to the warrant requirement.
See United States v. Duchi,
Exigent circumstances exist where law enforcement officers have a “legitimate concern for the safety of themselves or others.”
United States v. Vance,
Applying the historical facts аs found by the district court, we conclude that a reasonable officer would have been legitimately concerned for his safety and that of the other officers on the scene that day. The situation escalated quickly once the officers attempted to arrest Hill, and they did not approach Brown’s house until after a number of worrisome events had occurred. First Hill resisted arrest, then a woman ran at them from out of the house screaming threats, and they next became aware that another person was watching them from inside the doorway of the house. They were also aware that there might be a drug lab inside the house.
4
A reasonable officer would have concluded in these circumstances that the officers faced a dangerous situation and that there could be other persons in the house who threatened their safety.
See United States v. Ball,
After examining the record, we conclude that the initial entry and search were justified by exigent circumstances and did not violate the Fourth Amendment. The district court therefore did not err by denying the motion to suppress.
See Rupp v. Omaha Indian Tribe,
Appellants argue that they should not have been held accountable for fifty or more grams of methamphetamine. They point to language in 21 U.S.C. § 841(b)(1)(B), which sets minimum and maximum penalties for any “violation ... involving — ... 50 grams or more of ... methamphetamine.” (emphasis added). Appellants argue that a conspiracy can only involve fifty grams or more if there is an agreement to make that amount (and that an attempt can only involve fifty grams or more if the defendants actually try to make that amount). They contend that the jury instructions should have required such findings. The government responds that their argument is contrary to the plain language of the statute and that the jury was correctly instructed on the elements of conspiracy and attempt.
The district court instructed the jury that, in order to convict the defendants of conspiracy or attempt, it must find that “the violation of the law involved the manufacture of 50 grams or more of a mixture and substance of methamphetamine.” The instructions followed the plain language of the statute,
see United States v. S.A.,
Appellants also claim that the jury instructions modified an essential element of the offense charged and thus constructively amended the indictment.
See United States v. Johnson,
*1023
Appellants also contend that the § 841(b)(1)(B) phrase “mixture or substance containing a detectable amount of methamphetamine” only applies to usable or marketable mixtures or substances. They point out that the government’s expert testified that only 0.53 grams of the mixtures found in the lab were usable methamphetamine аnd that 91.9 grams were unusable toxic liquid solutions of a type that could represent waste product. Some courts have concluded that only usable or marketable mixtures were intended by Congress to satisfy the statutory amount.
See United States v. Richards,
Both
Chapman
rationales support the conclusion that the solutions in this case fall within the scope of § 841(b)(1)(B). First, undisputed expert testimony established that the liquid solutions here were mixtures containing methamphetamine under the plain meaning of that term. Second, a “market-oriented” analysis supports the finding that the liquid solutions in the lab were mixtures or substances containing methamphetamine. The market for this type of methamphetamine is based on its manufacture in labs like that of the conspirators, and that process involves creation of liquid solutions like those seized here, a process that results in a product for distribution.
See United States v. Palacios-Molina,
Hill raises two individual claims on appeal, the first of which is that the district court erred by allowing opinion testimony from four government witnesses who had not been disclosed as experts. These witnesses testified that certain evidence was consistent with the normal practice of drug dealers, and Hill asserts that this testimony should only have been permitted from designated experts. To establish a right to reversal, Hill would have to show both that a discovery rule was violated and that the violation was prejudicial.
See United States v. Longie,
*1024
Hill also appeals the denial of his motion for judgment of acquittal on the charge of possession with intent to distribute, arguing that the 0.47 grams of methamphetamine found in his truck was not a sufficient amount to establish intent to distribute. There was adequate circumstantial evidence to support the jury’s conclusion, however. The methamphetamine was divided into five individual packages, found with other packaging material and a sheet of drug notes, and Brown testified that Hill regularly sold methamphetamine to a number of customers.
See United States v. Barrow,
Kuenstler also raises two individual claims on appeal. First, she argues that the district court did not adequately instruct the jury on Brown’s credibility in light of her cooperation agreement. The court’s instruction informed the jury that Brown had reaсhed an agreement with the government and that the jury was responsible for determining her credibility. The district court did not abuse its discretion by refusing to give a more specific instruction.
See United States v. Kouba,
III.
In sum, we conclude that exigent circumstances justified the entry into Brown’s house and that the Fourth Amendment was not violated by the seizure of evidence found there; that appellants’ arguments based on the methamphetamine statute, the indictment, and the jury instructions are without merit; and that the district court neither abused its discretion in its evidentiary rulings or jury instructions nor erred in ruling on motions for acquittal or severance. The judgments are therefore affirmed.
Notes
. Brown testified that she had identified Kuenstler as her friend when officers came to the door (they claimed that she said nothing and only pointed to Kuenstler’s presence).
. The government contends in addition that Brown had also consented to the officers entering the house and looking around.
. A member of the joint methamphetamine task force testified at the suppression hearing that the officers knew there was a "very high likelihood" that there was a methamphetamine lab in the house.
