Detectives believe the actress violated her probation in her scuffle with a Betty Ford employee

So much for Lindsay Lohan‘s clean start in 2011.

Police now assert the actress did, in fact, commit battery against a Betty Ford employee in a Dec. 12 scuffle – and plan to hand the case over to local prosecutors for review.

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“The investigation determined Ms. Lohan violated several aspects of her probation, including the battery [charge],” the Palm Desert Police Department said in a press release Monday, adding that they plan to notify Lohan’s probation officer.

Lohan’s attorney, Shawn Chapman Holley, wasn’t immediately available for comment. Lohan, 24, was released from rehab Monday and faces a routine Feb. 25 progress review hearing.

L.A. Superior Court Judge Elden Fox previously warned Lohan that any more slip-ups would be met with six months in jail. As of Tuesday, however, the court still hadn’t received formal notice of the incident.

Betty Ford employee Dawn Holland was fired the same day she went public with claims that Lohan threw a phone at her and yanked another phone out of her hand, causing a sprain after a confrontation at the famed Rancho Mirage, Calif., clinic.

Holland stated that Lohan was acting “out of control” and had alcohol on her breath and refused to take a Breathalyzer test when she was caught coming home past curfew.