Shouldn't people know by now drugs are not allowed on planes, and any attempts to smuggle some will have them arrested? It turns out 48-year-old actress Mackenzie Phillips, best known for her role on the sitcom "One Day A Time" over 20 years ago doesn't know any better and she was busted for possession of cocaine and heroin at Los Angeles International Airport on Wednesday morning. She was taken into custody after security found the drugs in her carry on luggage.

According to TMZ, Phillips, who is the daughter of The Mamas and the Papas lead singer, John Phillips, had her stuff screened by TSA and the officers recovered some baggies and balloons believed to contain heroin and cocaine.

"During a second screening process, a small amount of what was believed to be heroin and cocaine was discovered on her person," Sgt. Jim Holcomb, spokesman for Los Angeles Airport Police, told E! News.

"She is being booked at Pacific Division and then transferred to Van Nuys," added Holcomb. "Bail has not been set."

The actress was exposed to drugs from a very early age and has a long history of drug abuse. As a kid, she said she prepared joints for her late father.

"I grew up in mansions, but everything was dirty and broken," she told USA Weekend magazine in 1999. "Very little was going on inside except sex, drugs and rock and roll."

Early on, she knew she had a problem.

"The first time I had a drink, it woke up the sleeping monster inside me," she said.

According to NNDB, the actress, who is also the half-sister of Chynna Phillips and Bijou Phillips, was fired from "One Day at a Time" on two separate occasions after she was late to work and so drunk or stoned she could not function. The first suspension was for a season in 1980. They welcomed her back in 1981 once she got clean, but she fell off the wagon and once again lost her job a couple years later.

In 1994, she turned her life around, appearing as a drug counselor on "90210." A few years later, she also starred on Disney show "So Weird," saying the network's producers, "embraced [her] baggage."

"Why did I survive?" she asked in USA Weekend. "Maybe it's to say to others, 'This happened to me. It could happen to you.' I don't mind being a poster girl."

Mackenzie must be in a really bad place if she is bringing drugs in her hand luggage. Maybe this arrest will be the motivation she needs to clean up. She has been in rehab a few times and nothing really worked long term for her. At 48, she is looking at an early death if she keeps using.