03/29/2011 AT 07:40 PM EDT
Here's one crisis that Lindsay Lohan
can scratch off her list.
The Riverside County District Attorney decided Tuesday not to prosecute Lohan for assaulting
a Betty Ford Center employee in a Dec. 12 scuffle.
"We are not filing any charges in the Lindsay Lohan case due to insufficient evidence," DA spokesman John Hall tells PEOPLE.
Lohan 24, allegedly threw a phone at Dawn Holland and yanked another phone out of her hand after the employee accused Lohan of getting drunk and returning to the rehab facility past curfew.
The DA's office reviewed a local sheriff's report and conducted its own investigation at its own pace.
"It wasn't looked at any differently than other cases, and we didn't put any special priority on this," Hall says. "We also had to re-interview subsequent times several witnesses in the case."
Lohan's legal problems are far from over.
She still appears to be headed to trial
over a felony grand theft accusation involving a necklace she allegedly swiped from a Venice, Calif., jeweler. A preliminary hearing is scheduled for April 22.