On July 15 , Lesnar was notified of a potential anti @-@ doping policy violation by the United States Anti @-@ Doping Agency ( USADA ) stemming from an undisclosed banned substance in an out @-@ of @-@ competition sample collected on June 28 . Shortly after this was announced , WWE said Lesnar 's match with Randy Orton at SummerSlam would still take place . Hunt told UFC to either pay him half of Lesnar 's purse or let him out of his contract . He later changed his mind on Twitter , and asked for the whole purse . UFC has not yet publicly responded to Hunt . Lesnar told the Associated Press , " We will get to the bottom of this . " On July 19 , the UFC announced that a second sample taken in @-@ competition on July 9 tested positive for the same banned substance discovered in the previous out @-@ of @-@ competition sample .