Where an FBI agent had trouble with his memory and testified falsely, a U.S. District Court did not abuse its discretion in denying a motion for mistrial.The 7th U.S. Circuit Court of Appeals affirmed a decision by U.S. District Judge Philip P. Simon, Northern District of Indiana.In February 2015, Ronnie Cosby exchanged text messages with an individual identified as “Cool.” Cosby arranged a prostitution call for …