Lindsay LohanTroubled starlet Lindsay Lohan has passed all of her drug tests since leaving the Betty Ford Center, her father Michael Lohan told RadarOnline.

"Lindsay is doing four or five tests a week, and she has passed all of them with flying colors," he said regarding the random drug tests his daughter must take since leaving rehab.

After completing rehab earlier this month, Lohan has been laying low and keeping away from the people and places that led her down a troubled path last year.

"She is serious about staying healthy and is avoiding all the old things she used to do," her father said. "She's doing really great right now."

Though she's been staying out of trouble, trouble seems to find her. After a former staff member at the Betty Ford Center accused Lohan of attacking her, and an official police report was delivered to a judge, it seemed like Lohan could face more jail time.