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*The toxicology report for Justin Bieber’s recent arrest in Miami Beach showed that he tested positive for marijuana and Xanax, a law enforcement source told South Florida’s NBC 6 on Wednesday.

Police obtained a urine sample from Bieber following his arrest last Thursday, Jan. 23, when authorities said he raced through a Miami Beach neighborhood in a rented Lamborghini, cursed at a police officer as he resisted arrest and admitted to consuming drugs and alcohol.

The 19-year-old pleaded not guilty Wednesday to charges of DUI, resisting arrest and driving with an expired license in Florida. Meanwhile, new police reports surfaced showing his alcohol breath tests were under the legal limit, even for an underage driver.

Court records show that Bieber’s attorney filed the written plea Wednesday in Miami-Dade County. Bieber already has an arraignment set for Feb. 14, but Florida law doesn’t require Bieber to be present.

Justin Bieber makes his way through a crush of media and fans Wednesday evening as he arrives at 52 Division to turn himself in to Toronto police.

Justin Bieber makes his way through a crush of media and fans Wednesday evening as he arrives at 52 Division to turn himself in to Toronto police.

News of his latest brush with the law comes as Bieber turned himself in to Toronto police on Wednesday evening and was charged with one count of assault for allegedly hitting a Toronto limousine driver several times in the back of the head in December.

In a statement Toronto police said they were called to the scene of an altercation in the early morning hours of Dec. 30, 2013. Bieber had attended a Toronto Maple Leafs hockey game that night and was one of six people who were picked up by a limousine from a nightclub. The incident occured en route to a hotel.

“The Toronto Police Service requested that Justin Bieber appear in Toronto today to face an allegation of assault,” the singer’s attorney Howard Weitzman said in a statement. “We anticipate that this matter will be treated as a summary offense, the equivalent of a misdemeanor in the United States. Our position is that Mr. Bieber is innocent. As the matter is now before the court, it would be inappropriate to address the specifics of either the allegation or of our defense at this time.”

Bieber is next scheduled to appear in court in Toronto on March 10.

Justin Bieber is swarmed by media and police officers as he turns himself into Toronto police Wednesday for an expected assault charge

Justin Bieber is swarmed by media and police officers as he turns himself into Toronto police Wednesday for an expected assault charge

It was also revealed Wednesday an online petition describing Bieber as “reckless, destructive, and drug abusing” has received enough signatures to earn an official review by the White House.

The petition, “Deport Justin Bieber and revoke his green card,” was started last Thursday, Jan. 23 on the We The People/White House website.

More Details of Bieber’s Miami Incident:

Bieber and R&B singer Khalil Amir Sharieff were arrested last week during what police described as an illegal street drag race between a Lamborghini and a Ferrari. Neither has been charged with drag racing, which is a crime in Florida.

Police said Bieber cursed repeatedly at a police officer after the 4:09 a.m. traffic stop and acknowledged smoking marijuana, drinking and taking an unknown prescription medication. The Miami Beach Police reports released Wednesday, however, show that Bieber was given four alcohol breath tests, with the first two not usable because of insufficient volume of breath.

The third test, administered at 5:37 a.m., showed an alcohol reading of .014 and a fourth, at 5:40 a.m., came up at .011. Both are under the .02 limit in Florida for a driver under the legal drinking age of 21. The limit for drivers above that age is .08.

Another police document described Bieber as “excited, talkative, profanity, cooperative, insulting, and cocky” and noted that he had a pronounced odor of alcohol on his breath, bloodshot eyes and a flushed face. During DUI field tests, officers noted that Bieber could not walk heel-to-toe as instructed, had trouble turning without losing his balance and could not smoothly follow a moving object with his eyes.

Regarding the marijuana, one officer said he noticed a strong smell of the drug while Bieber was sitting in the back of a police car. The officer asked Bieber about it.

“Yeah, we were smoking all night at the studio,” the report quotes Bieber as replying.

As for the prescription drugs, Bieber told police he didn’t know what they were but they were for treatment of anxiety.

“Well, my mom takes care of all that stuff for me,” he said, according to the report.