MEMORANDUM AND ORDER
J. THOMAS MARTEN, JUDGE
The court has before it defendant Amos Becknell’s Motion in Limine (Dkt. 43), which requests the court for an order limiting the presentation of certain evidence by the government before the jury. The court is prepared to rule.
I. 704(b) Opinion Evidence
In this case, the government must prove that Becknell knowingly possessed cocaine with the intent to distribute it, that he possessed a firearm in furtherance of drug trafficking, and that he knowingly possessed firearms as a felon. Becknell asks the court to prohibit the government’s law enforcement witnesses from giving their opinions regarding his mental state or condition constituting an element of any of the crimes he is charged with. Becknell anticipates that the government may try to present evidence in the form of an officer’s opinion that a person demonstrating various characteristics is probably committing a crime, and he objects to this evidence pursuant to Federal Rule of Evidence 704(b).
Expert witnesses may give testimony based on specialized knowledge if it will assist the jury to understand the evidence or determine a fact in issue. See Fed. R. Evid. 702. “An opinion is not objectionable just because it embraces an ultimate issue.” Fed.R.Evid. 704(a). But Rule 704(b) provides an exception:
In a criminal case, an expert witness must not state an opinion about whether the defendant did or did not have a mental state or condition that constitutes an element of the crime charged or of a defense. Those matters are for the trier of fact alone.
Fed. R. Evid. 704(b). But the scope of the rule is limited. “Rule 704(b) only prevents experts from expressly stating the final conclusion or inference as to a defendant’s actual mental state. The rule does not prevent the expert from testifying to facts or opinions from which the jury could conclude or infer the defendant had the requisite mental state.” United States v. Richard, 969 F.2d 849, 854–855 (10th Cir. 1992). Factual observations by an officer are permissible as relevant and not in violation of Rule 704(b). See, e.g., United States v. Figurero-Cruz, 500 Fed. App’x 759, 764–65 (10th Cir. 2012). And an officer may give his opinion about how drug traffickers behave. See id. Even when an officer makes statements that imply a belief that the defendant was in fact aware of the nature of the drug transaction, those statements may be admissible as long as the officer does not expressly draw that conclusion or inference for the jury. See Richard, 969 F.2d at 855.
The court denies Becknell’s motion at this time, as the court cannot know what statements any of the government’s witnesses will make. This court will not prevent an officer from testifying as to his or her opinion based on training and experience and specialized knowledge, as the rules of evidence allow. The Federal Rules of Evidence prohibit the government from introducing an expert witness’s express opinion on Becknell’s mental state, so no in limine order is necessary to prevent that evidence. Becknell is free to make a contemporaneous objection to any testimony he believes crosses the line at trial.
II. Gang Affiliation
Becknell anticipates that the officers may testify about his alleged gang affiliation, and he objects to this evidence as overly prejudicial pursuant to Rule 403, irrelevant pursuant to Rule 401, and inadmissible potential character evidence pursuant to Rule 404(a)(1). The government responds that it is not planning on presenting this evidence unless defendant opens the door for it.
The court grants Becknell’s motion in limine. Becknell’s identity is not at issue, and he is not facing conspiracy charges, so the evidence of his gang affiliation is not particularly relevant—let alone probative—in this case, and it is substantially prejudicial. This evidence is therefore inadmissible unless Becknell opens the door or presents evidence or testimony in his case in chief in direct contravention of his gang affiliation.
III. Reference to Criminal Informant
Becknell moves the court to rule inadmissible any reference by officers regarding a confidential informant in describing how the officers came to apply for a search warrant in this case. Becknell argues that unless the informant testifies, testimony about information the informant allegedly provided to the officers is inadmissible hearsay under Rule 802. He also argues that this testimony would deprive him of his Sixth Amendment right to confront witnesses against him.
The government correctly cites United States v. Freeman, 816 F.2d 558 (10th Cir. 1987) and United States v. Cass, 127 F.3d 1218 (10th Cir. 1997) for the rule that an out-of-court statement by an informant is admissible, and not hearsay, when offered for the limited purpose of explaining why a government investigation was ...