Details: Paris Hilton Denied Purse Containing Cocaine was Hers

ET has learned new details about Paris Hilton's arrest over the weekend.

According to a court document obtained by ET, Hilton was arrested for possession of a controlled substance on Friday night near the Wynn Hotel in Las Vegas, NV when a traffic officer detected the smell of marijuana coming from a 2009 Cadillac Escalade she was a passenger in.

According to the documents, Hilton began rolling up the car window when she noticed police. The driver of the car, Cy Waits, failed a field sobriety test, the arrest report claims. Police say Hilton did not want to step out of the car because she was "embarrassed" by people taking photographs, and asked police to accompany her to the Wynn Hotel so she could use the bathroom.