Leif Garrett's been battling substance abuse problems for years, which is why he took part in Season 4 of 'Celebrity Rehab.' However, he stormed out of the Pasadena Recovey Center, later telling 'The Los Angeles' Times that producers encouraged him to relapse for dramatic purposes.

Last night Bob Forrest and Rachel Uchitel checked up on Garrett as part of 'Celebrity Rehab Revisited' (Sun., 9PM ET on VH1) and things did not go too well. Garret told the pair that he'd been taking lots of painkillers following a serious motorcycle accident, and then he admitted dabbling in marijuana and booze.

That's when Bob criticized Garrett's "cavalier and laissez-faire attitude toward alcohol," which did not sit well with the former teen idol. Saying "I really do not appreciate it," Garrett walked out. Again.

One of the most important and challenging things for any recovering addict is staying clean once they get out of rehab. 'Celebrity Rehab' chronicled their time within the treatment facility, but with 'Celebrity Rehab Revisited' (Sun., 9PM ET on VH1), we got to see the staff checking in with former patients out in the real world to see how they're faring.

Head Counselor Bob Forrest got Jaimee Foxworth to agree to a drug test, but didn't tell her it would go back 90 days. It was an extra check to make sure she'd been able to stay clean, and the results came back fantastic. No marijuana, sleeping pills or any other drugs that they could detect.