Lindsay Lohan, who has checked out of rehab, could be charged with battery for an incident at the Betty Ford Centre.
US Sheriff investigators have found that the actress violated her probation during an alleged altercation with a technician at the rehab last month.
Now, they are considering charging her with battery for the incident that occurred on December 12, reports the Telegraph.
Investigation details will be sent to the Los Angeles County Probation Department this week, said Riverside sheriff''s Sgt. Joe Borja.
A Beverly Hills judge has said Lohan will be jailed if she violates probation.
The troubled actress had returned to the drug dependency centre after curfew and allegedly refused rehab worker Dawn Holland's request to take a breath test.
Lohan is accused of pushing Holland, who then dialled police, and ripping the phone away and injuring Holland's wrist.