LOS ANGELES, California (AP) -- Lindsay Lohan's best bet for avoiding jail time is to go back into rehab yet again and remove herself from a high-flying party lifestyle -- if not, she could be facing up to six months behind bars, legal observers said.

Lohan, 21, was less than two weeks out of a recovery program and was voluntarily wearing an alcohol-monitoring device when she was arrested Tuesday in Santa Monica.

She is under investigation for two misdemeanors -- driving under the influence and with a suspended license, and felony cocaine possession.

Her lawyer, Blair Berk, has said she had a "relapse" and was receiving medical care at an undisclosed location.

A call to Lohan's publicist was not returned.

The actress completed more than six weeks in rehab less than two weeks ago, and had checked into another recovery clinic in January.

Over the weekend, she was photographed at a party in a pink bikini, with the monitoring device on her ankle.

That behavior won't cut it anymore and neither will spa-style clinics, said Barry Gerald Sands, a Century City defense attorney who's also a certified drug and alcohol counselor.

"Whatever you have done in the past, do a 360-degree turn and go the other way," Sands said. "She has to change her alleged friends, people sharing or selling her drugs. She has to lead a clean and sober life.

"Silk-sheet recovery homes don't do the job."

If Lohan is charged with a crime, she could ask a judge to order her to remain in rehabilitation while she awaits trial, Sands said.

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