Terry Wilson was convicted of possession with the intent to distribute methamphetamine in violation of 21 U.S.C. § 841 (1988). On appeal, Wilson challenges the district court’s 1 denial of his motion to suppress certain evidence and claims error in the admission of testimony of a drug agent that 130 grams of methamphetamine is not a “user” quantity. We affirm.
BACKGROUND
On January 4, 1990, a confidential informant and Agent Michael Dudley of the Federal Bureau of Investigation engaged in a general discussion regarding drug trafficking in Eastern Iowa. Special Agent Terry Klooster of the Iowa Division of Criminal Investigation, a member of the same federal drug task force as Dudley, met with the informant on January 12, 1990, and the informant told him that Wilson was attempting to set up a methamphetamine lab in the area. The informant called Klooster on January 23, 1990, and revealed that Wilson possessed one-half pound of methamphetamine which he was trying to sell. The informant indicated that he and Wilson would travel that day from a small nearby town to a designated bar in Cedar Rapids, Iowa, trying to find a buyer for the entire amount of the drug. The informant also stated that they would travel to Cedar Rapids in a minivan and a blue Ford Escort and the methamphetamine would be contained in a silver-colored metal briefcase. Klooster asked the informant if he would arrange for a small purchase of methamphetamine from Wilson, to which the informant agreed. The informant later notified Klooster that Wilson would only sell the drug in its half pound form and not the smaller portion desired.
Law enforcement officials set up surveillance around the city in an effort to observe the actions of the two men. Dudley and Klooster eventually spotted Wilson and the informant sitting with another person at the designated bar in Cedar Rapids. There the informant covertly told Klooster that Wilson still possessed the methamphetamine, and that it was contained in the metal briefcase in the blue Ford Escort in the bar’s parking lot. Klooster then stepped outside and observed the briefcase in the back seat of the car. Wilson attempted to drive away from the bar approximately one hour later but was prevented from doing so by a police vehicle. Klooster and Dudley approached Wilson at this time and informed him that they had probable cause to believe he was in possession of methamphetamine. Wilson subsequently drove his car, in the company of law enforcement officials, to the federal building in Cedar Rapids. Although Wil *809 son was not placed under formal arrest, there is no dispute that Wilson was not free to leave and that his detention constituted an arrest. .No questioning was done or.search performed until a search warrant was issued by a magistrate judge that same night. Once the warrant was executed, agents found the briefcase to contain over 130 grams of methamphetamine.
At trial Agent Dudley testified that, based upon his experience and training, 130 grams of methamphetamine was a larger quantity of the drug than that generally possessed by users. Wilson’s objection to this testimony was overruled. The jury returned a guilty verdict on May 29, 1991. The court sentenced Wilson to sixty-five months imprisonment and five years of supervised release.
DISCUSSION
Wilson argues that the information obtained from the informant by law enforcement officials did not provide probable cause for his warrantless arrest and seizure of the silver briefcase. Wilson asserts that the trial court erred in relying on
Illinois v. Gates,
Although we think the issue is close, we agree with the district court’s application of
Gates
in holding that probable cause exists when there are sufficient facts to justify a prudent person’s belief “that contraband or evidence of a crime will be found in a particular place.”
Gates,
The tip upon which agents acted was substantially corroborated by observations of the agents. As Justice White observed' in his concurring opinion in Gates:
Even, however, had the corroboration related only to completely innocuous activities, this fact, alone would not preclude the issuance of a valid warrant. The critical issue is not whether the activities observed by the police are innocent or suspicious. Instead, the proper focus should be on whether the actions of the suspects, whatever their nature, give rise to an inference that the informant is credible and that he obtained his information in a reliable manner.
This court applied similar reasoning in
United States v. Reiner Ramos,
*810 [T]he corroboration of minor, innocent details can suffice to establish probable cause, “The theory connecting reliability and corroboration is that an informant who is correct about some things more likely will be correct about critical unverified facts, and it is not necessary to a finding of reliability that the corroboration extend to illegal activity as well as to innocent details.”
Reiner Ramos,
Wilson also argues that the court improperly allowed the drug agent to testify as to whether 130 grams of methamphetamine constitutes a user quantity. He contends that this testimony improperly touched upon the defendant’s mental state or condition, constituting an element of the crime charged in violation of Federal Rule of Evidence 704(b). 3
We find no abuse of discretion by the district court in allowing Agent Dudley to testify regarding typical user quantities of methamphetamine. Such testimony aids the jury by putting the drug dealer in context with the drug world. It is a reasonable assumption that a jury is not well versed in the behavior and average consumption of drug users.
See United States v. McDonald,
For the foregoing reasons, we find no error in the conviction of the defendant by *811 the jury or the sentence handed down by the district court.
Judgment affirmed.
Notes
. The Honorable David R. Hansen, United States District Judge for the Northern District of Iowa.
.
At the time of the arrest, the agents delayed their search until they were able to obtain a warrant to search the closed metal container.
See United States v. Chadwick,
. This rule states:
No expert witness testifying with respect to the mental state or condition of a defendant in a criminal case may state an opinion or inference as to whether the defendant did or did not have the mental state or condition constituting an element of the crime charged or of a defense thereto. Such ultimate issues are matters for the trier of fact alone.
Fed.R.Evid. 704(b).
