No plain error in prolongation of traffic stop, given the minimal length of traffic stop. Sufficient evidence for money laundering, given illicit source of funds.
http://media.ca7.uscourts.gov/cgi-bin/rssExec.pl?Submit=Display&Path=Y2018/D09-05/C:16-4105:J:Rovner:aut:T:fnOp:N:2212702:S:0
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.