More legal trouble for former Las Vegas Raiders first-round pick Damon Arnette ... he was just arrested again -- this time after cops say they found a cocaine-like substance in his pocket during a traffic stop.
According to police documents, obtained by TMZ Sports, Arnette was pulled over twice in his gray Dodger Charger on Monday night/Tuesday morning in Miami Beach, Fl.
During the first stop, which police say occurred at around 8:56 PM on Monday, cops say in the documents they found Arnette had been driving on a suspended license -- and issued him a citation.