Bieber, 19, remains in police custody after he was arrested in Miami Beach Thursday for allegedly driving a Lamborghini under the influence of drugs and/or alcohol, drag racing, resisting arrest without violence and driving without a valid license.
Tests taken after his arrest showed Bieber was under the influence of drugs, Miami Beach Police Chief Raymond Martinez told the Herald.
The Hollywood Reporter said Bieber's fellow musician, Khalil Sharief, was also arrested and charged with DUI.
Police said they stopped Bieber because they saw him racing shortly after leaving a nightclub, then determined he was intoxicated, TMZ said, adding the singer allegedly failed a field sobriety test.
People.com said Bieber has been in Miami all week and visited a strip club with friends Monday night.
In a separate criminal case, the teen is under investigation for allegedly throwing eggs at a neighbor's home in Los Angeles several weeks ago. The neighbor said the prank caused thousands of dollars in damage.
TMZ has said Bieber's management is concerned about his outrageous behavior and wants him to check into rehab.
In addition to allegedly smoking marijuana, the singer frequently drinks dangerous cocktails of codeine cough syrup mixed with soda, TMZ said.