In June 1998, Adler joined the newly reformed hard rock band BulletBoys, along with future Guns N' Roses guitarist DJ Ashba. The group recorded an album and announced a US summer tour with Faster Pussycat, Bang Tango and Enuff Z'nuff. However, Adler's return to music was cut short the following September, when he pleaded no contest to two counts of battery stemming from attacks on two other women in separate domestic violence incidents. He was sentenced to a 150-day term in prison and three years' probation, with the condition of undergoing a year of domestic violence counseling and a ban on using illegal drugs.