While she declined to comment on the allegations, saying it was an ongoing investigation, Berk said the police department is "selling" an "unverified" story.
The contents of the preliminary police investigation were first reported on Thursday by TMZ.
Lieutentant Mitch McCann, a spokesman for the Beverly Hills police, said that he was unable to confirm the details and declined further comment until the final report is ready in the coming days.
Likewise, Los Angeles County District Attorney spokeswoman Jane Robison says the office is still awaiting toxicology results and no charges have been filed against the 20-year-old Mean Girls star.
With Lohan's arraignment not taking place until Aug. 24, there's plenty of time for the police and prosecutors to get their story straight.
Lohan was arrested over Memorial Day weekend, when she plowed her Mercedes over a curb and into some trees. Police said they discovered a "usable amount" of a substance believed to be cocaine on the scene of the May 26 crash. Two days later, it was Berk who reportedly shuttled Lohan to Promises Malibu to sober up.
Her father, Michael, told E! Online that Lindsay spent the first stage of her treatment detoxing from alcohol and narcotics, including the painkiller OxyContin, and then would receive intense counseling to avoid using again. The elder Lohan also said that Lindsay had been using cocaine, but didn't specify when she took the drug.
Lindsay Lohan was expected to check out of rehab earlier this week, but mother Dina announced Monday that Lindsay was extending her stay.
Lindsay's sobriety struggles have also led to the cancellation of her much-hyped (and much-maligned) 21st birthday celebration originally scheduled to be a multiday blowout in Las Vegas next week.
Instead, Dina says she and Lindsay's kid sisters are planning to mark the occasion on Monday with a quiet get-together away from the Promises campus.