Bieber is now in custody and is at the police department where he is being tested — presumably to more precisely measure his blood alcohol level. Our law enforcement sources say Justin was given a field sobriety test at the scene … and failed.
His next stop will be jail, where he will be booked and processed and bail will be set.
We’re told Bieber had just left a club and was driving in a Lamborghini at the time cops spotted him. Sources say the person Justin was racing was also arrested.
Based on what we know … the traffic stop was for drag racing and cops determined he was driving under the influence.