FILE - In this Sept. 15, 2012, file photo, Julio Cesar Chavez Jr., left, lands a punch against Sergio Martinez in the 12th round of their WBC middleweight title boxing match in Las Vegas. A Top Rank Inc. spokesman said on Wednesday, Sept. 19, that Chavez tested positive for marijuana after his first professional loss last weekend in Las Vegas. (AP Photo/Julie Jacobson, File)