Right now he's a poster boy for health compared to the shape he was in during the Dogma - JASB
period. To call Jason a complete wreck would be treating his condition very kindly. If there was a prescription or illegal drug within reach he'd probably have put it into his body.
That's why he wasn't in Jersey Girl.
Kevin wasn't going to let him back on-screen in one of his movies until he got himself cleaned up.