Cris Carter says he tried to help Randy Gregory conquer his substance abuse issues by trying to get him into a successful rehab program ... and even though it's failed so far, he's not giving up.
With the Dallas Cowboys star suspended indefinitely after once again violating the league's substance abuse policy, Carter talked about the effort he's made to help Gregory over the years.
"It's unfortunate for him," Carter said on FS1's "First Things First" ... "He's one of a number of guys through the years I've tried to help.