BEVERLY HILLS, California — A Beverly Hills judge on Monday issued an arrest warrant for Lindsay Lohan after the actress failed a drug test.The 24-year-old has been ordered to appear in court Friday and is now facing possible jail time for violating her probation.Lohan confirmed on her Twitter page last week that she failed a court-ordered drug and alcohol screening.A judge had threatened her with 30 days in jail for each probation violation.