Account guarantee agreement for cattle hedging account void where plaintiff had no knowledge of the illicit trades being made using it.
Duty to mitigate begins with actual knowledge.
http://media.ca7.uscourts.gov/cgi-bin/rssExec.pl?Submit=Display&Path=Y2018/D08-13/C:17-2100:J:Hamilton:aut:T:fnOp:N:2201302: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.