
Justin Bieber acts like an animal because of massive drug abuse ... that's what the lawyer in Bieber's paparazzi assault case believes and he's dragging in Biebs' closest friends to prove it.
We've learned the lawyer repping the paparazzo who claims Bieber ordered his goons to beat him up will subpoena Lil Za, Lil Twist, Khalil, Scooter Braun...