MacKenzie Phillips in Drug Bust at L.A. Airport
"She was being screened by airport security when a small amount of what appeared to be heroin and cocaine were found on her person," Sgt. Jim Holcomb said. "She was arrested at about 10 a.m. and is still in custody."
He added: "The substances were found in balloons and baggies."
Phillips was booked at the Van Nuys, Calif. jail, and bail was set at $10,000.
The One Day at a Time actress, 48, has long struggled with drug addiction, which led to her termination from the show.
Phillips resurrected her showbiz career in the late 1990s, starring in the Disney Channel series So Weird as a former rock star dealing with motherhood.
A rep for the actress wasn't immediately available for comment.
1994: MacKenzie Phillips plays a drug counselor on 90210
1981: Phillips and her dad kick their $1 million drug habit
MacKenzie's first PEOPLE cover
On Newsstands Now
- Kim's Delivery Room Drama!
- Katie: A Year After Split
- Princess Kate: Palace's Baby Plan Revealed
Pick up your copy on newsstands
Click here for instant access to the Digital Magazine