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One Day at a Time is both the title of a seminal postfeminist late-'70s sitcom and a 12-step mantra, and both apply to its star and recovering substance-abuser Mackenzie Phillips. IMDb lists her as having been clean and sober since 1992, but TMZ is reporting that the actress was arrested today at LAX, allegedly for possession of heroin and coke. She's currently in custody:

At 10:00 AM, officers responded to Terminal 4, where Phillips was being screened by TSA. During the screening process, some baggies and balloons believed to contain heroin and cocaine were recovered.

Obviously, this marks a significant backwards step in Phillips's recovery. It now remains to be seen if her first public statement on that matter will demand privacy at this difficult time, or instead go the Tatum O'Neal route, blaming everything from a dead dog to background research, before eventually lavishing praise on the compassionate TSA workers who saved her from a serious and impending relapse.