LOS ANGELES -- Former USC quarterback Mitch Mustain made headlines on national signing day last month when he was arrested on a narcotics charge, but he tried to put that behind him Wednesday at USC's annual pro day.
Among the departing players working out in front of NFL scouts, coaches and general managers, Mustain was the only quarterback in attendance and threw to a number of pass-catchers in throwing and receiving drills, including wideout Ronald Johnson, tight end Jordan Cameron and running backs Allen Bradford and C.J. Gable.
In all, he threw about 60 passes, plus ran 40-yard dashes timed between 4.90 and 4.93 and put up 18 repetitions of 225 pounds.
"I think he did great today," Johnson said. "He was the only quarterback here -- I'm surprised he didn't throw his arm out."
Mustain said he didn't change any of his throwing fundamentals in the offseason, but his throwing motion looked a lot sharper than it did in his one start last season at Notre Dame and half of play against Oregon State. When he missed Wednesday, he was missing slightly long.
Mustain was arrested last month on a felony narcotics charge of selling prescription drugs after allegedly selling a substance he passed off as Adderall to an undercover officer. But the substance sold was lisdexamfetamine dimesylate, similar to Adderall but not a controlled substance and thus not punishable as a felony.
Mustain will face a pre-trial diversion program, which includes 100 hours of community service and a drug education program. He also must not be involved in a police incident for a year.
He said Wednesday he doesn't believe the arrest will cause any problems for him going forward.
"I don't feel like there's an issue with that," he said. "It was an isolated incident, and I feel like I've more than proven myself beyond that. That'll take care of itself."
Mustain was projected as a late-round pick before the incident, so at this time it's not considered likely he'll be drafted next month. He said teams have not been overly enthused about his play thus far in the workout process but sounded somewhat optimistic for the future.
"Again, I only have to impress one team," Mustain said. "Get that one, and get on somewhere."
Mustain, 22, started only one game in four seasons at USC, a 20-16 home loss to Notre Dame in November, after transferring from Arkansas in 2007.
The Arkansas native was one of the most sought-after high school players in history.
Pedro Moura is a regular contributor to ESPNLosAngeles.com.