Yes she's back, back again, Lohan's back- and nobody is quite surprised. After another crazy week of drug tests, arrests and tweets, everyone's favorite child-actress-turned-tabloid topic is making headlines yet again. It turns out that a prison term and rehab didn't quite do all that they were supposed to because, yet again, Lindsay's substance problem has gotten her in some hot water that could very seriously threaten her career. Last Friday, gossip blog TMZ broke the story that Lohan failed a court-mandated drug test in her criminal case. According to her probation terms, she will be given 30 days in jail for a positive drug test. Although, according to a friend of hers, she has "really been making an effort to make herself better."The test was later confirmed to be positive for cocaine, and sources also revealed that it was only one of two failed drug tests-each potentially resulting in another 30 days of prison time. Apparently the "bad influences" Lindsay has been surrounding herself with has been a large part of the quick relapse. More than some foul friends, Lindsay could have feasibly ruined her last chance at a renewed career.

We also heard that Lohan's new film project, titled Inferno-a biopic about porn star Linda Lovelace-could potentially be in shambles. Beyond prison, Lohan's out-of-state travel privileges may be revoked. Considering she lives in California and Inferno is set to film in Louisiana, this will likely pose a serious issue. According to TMZ, "a source close to the film tells us shooting the picture in Los Angeles instead of Louisiana 'would radically change the budget.' . The film's top people are 'beyond irritated by the recent developments.'"

But what does Lindsay have to say about all this? She took to Twitter for a surprising apology. "Regrettably, I did in fact fail my most recent drug test and if I am asked, I am prepared to appear before judge Fox next week as a result." The most surprising part of her apology was when she took responsibility for her actions-something very out of character for Lohan. "This was certainly a setback for me but I am taking responsibility for my actions and I'm prepared to face the consequences," she wrote. She was seen Saturday night attending an Alcoholics Anonymous meeting-was she trying to get in the judge's good graces, or has she finally changed? Only time will tell.