I don't know why it matters...he took drugs, now he's gone...but anyway, just for fun, I looked it up...
According to this, he did indeed take cocaine.
http://www.outsidethebeltway.com/archives/7104
Quarterback Quincy Carter is expected to be released by the Dallas Cowboys Wednesday after testing positive for cocaine, league sources told FOX NFL Sunday insider John Czarnecki. Club owner Jerry Jones confirmed that Carter has been released. "It was not a difficult decision for me," he said, declining to elaborate.
Cowboys coach Bill Parcells, asked about Carter's release at a regularly scheduled news conference Wednesday at the team's training camp headquarters in Oxnard, Ca., said: "I'm saddened by this. I've got 18 months invested in this process, too. But we're going on."
Carter entered the league in the NFL substance abuse program and this is his second positive test, which by NFL rules would warrant a four-game fine — not a suspension. Parcells said offseason acquisition Vinny Testaverde, 40, will replace Carter as the Cowboys' starting quarterback. "Right now, that's the most experienced player that we have, and I'm confident in that player," he said.