Justin Bieber

More info has come back on Justin Bieber’s recent Miami DUI arrest. A toxicology report showed that the teen singer tested positive for marijuana and prescription medication, reports TMZ.com.

The report said the pop star’s urine was tested right after he was busted for driving under the influence on January 23 … and both THC and Alprazolam (the key ingredient in Xanax) in his system.

However, the report showed that Bieber tested negative for cocaine, opiates, meth and other drugs.

Bieber has pled not guilty to the charges.