Lindsay Lohan reportedly cannot leave the ground of the rehab facility she is currently in.

The actress is confined to the grounds of the Betty Ford Center in Rancho Mirage, Calif., where she is serving a 90-day rehab sentence, according to People magazine. Patients at the rehab clinic typically earn privileges allowing them to go off the premises for a short time, for example to go shopping, but not Lohan.

She will be reportedly confined to the clinic's 20-acre grounds.

"It is understood by the Betty Ford Center that your client is to remain on the premises for the duration of her 90-day stay in treatment," read a letter addressed to Lohan's attorney, Shawn Holley, and filed with the Los Angeles Superior Court.

However, a source told the magazine that Betty Ford is "not a jail" and cannot hold a patient against his or her own will. The only control they have is the ability to "closely monitor patients via security and technicians 24 hours a day." Patients are also forbidden from having a cell phone while staying in the facility, and they can only make brief calls or use the Internet on weekends. Drug tests are randomly done.

Lohan checked into Betty Ford on May 3 after an L.A. County Superior Court judge approved her stay. The 26-year-old was originally scheduled to stay at Morningside Recovery in Newport Beach but upon their arrival there on May 2, she left less than an hour later because she was "not happy with the place."

Lohan's previous stay at Betty Ford resulted in an altercation with an employee in December of 2010 that involved police, according to the magazine. The actress reportedly got physical after the employee accused her of getting drunk and returning to the facility past curfew.

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Lindsay Lohan