06/28/2007 AT 02:15 PM EDT
had cocaine and nearly twice the legal amount of alcohol in her system when she was arrested last month
and cited for driving under the influence, TMZ.com
The information was posted Thursday morning – shortly after Beverly Hills police started forwarding reports on the case to the Los Angeles District Attorney's Office.
DA's Office spokeswoman Jane Robison tells PEOPLE they are still gathering reports from police and are not ready to release any information on Lohan or to charge her with a crime. Lohan's arraignment is set for Aug. 24.
The actress, who entered Promises treatment center
in Malibu on May 29, crashed her 2005 Mercedes SL-65 convertible around 5:30 a.m. on May 26. She was briefly hospitalized for minor injuries after the collision. Two other people were in the vehicle, but were not hurt.
Police later said they found a substance tentatively identified as "a usable amount of cocaine" in connection with the accident.
Earlier this week, the actress's mother, Dina Lohan, told PEOPLE
her daughter is "doing great," adding, "She's going to do Promises' extended care program."
In January, Lohan checked into the Wonderland Center
in West Hollywood, though after a month of treatment there she remained a fixture on the nightlife circuit. She had been able to leave Wonderland via its Sober Companions program
, in which patients may leave the center, accompanied by a staff member, for pressing work commitments or to visit family.
Reporting by HOWARD BREUER