Justin Bieber had been smoking marijuana and taking prescription drugs for anxiety leading up to his recent arrest for DUI in Miami Beach, according to a toxicology report obtained by TMZ.
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Urine tests processed by the University of Miami's Miller School of Medicine indicate the pop singer had THC and Alprazolam (the key ingredient in anti-anxiety medication such as Xanax) in his system. Bieber tested negative for cocaine, methamphetamines and Oxycodone, among other substances. See the report here.