FRE
Evidence of prior traffic stop in, as it helps to establish deft's knowledge of contraband in vehicle.
No error in the introduction of profile-based evidence that tended to establish mens rea.
http://www.ca5.uscourts.gov/opinions/pub/14/14-50846-CR0.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.