Looks like it’s back to the clink for Lohan. Following this weekend’s news that the fallen starlet had failed two recent drug tests—with one showing the presence of cocaine and another amphetamines—Lindsay’s probation has been revoked by Judge Elden Fox and a bench warrant issued for her arrest, sources told TMZ. Lohan admitted to failing her recent drug test via Twitter. “Regrettably, I did in fact fail my most recent drug test… Substance abuse is a disease, which unfortunately doesn't go away over night,” Lohan tweeted late Friday night. “I am working hard to overcome it and am taking positive steps forward every day." According to the conditions of her post-rehab release, the actress now faces up to 30 days in jail for failing her drug tests.