(Cover) - EN Showbiz - Lindsay Lohan is petrified she will be sent back to jail tomorrow.

The actress spent 13 days in jail and 23 days in rehab earlier this year after she violated the terms of her 2007 conviction for Driving Under the Influence (DUI). She has to undergo random weekly drugs tests as part of her court order, and failed one of them last week resulting in a California judge issuing a warrant for her arrest on Monday. The warrant has been placed on hold until Friday morning at 8.30am when the star must appear before Judge Eldon Fox at Los Angeles Superior Court.

Lindsay could be jailed for up to 30 days for any drug test she has failed, and the thought is terrifying her. She's scared she might have to go back to jail, a source told People. This is a wake-up call for her in a way. In the past, she dismissed everything, never took it seriously and now she's like 'Oh [expletive], something bad could happen.'

The drugs Lindsay tested positive for have not been officially released, although there have been reports it was cocaine and amphetamines. Although those close to her do not want to see the 24-year-old incarcerated again, some are reportedly beginning to think it is the only way she will clean up her life.

Her true friends are actually happy this is happening, the source explained. They never knew what it would take for Lindsay to listen. This might be it. But still, the attitude of some of her friends is, 'Oh no, not again.' It never ends with her.

In 2007, Lindsay served 84 minutes of a one-day prison sentence after pleading guilty to using cocaine and DUI. (C) Cover Media