L.A probation dept. not convinced by just sending Chris Brown to rehab

The L.A probation department is just not convinced by Chris Brown's rehab probation, as they believe the punishment is too little and too late for him.

According to sources, the probation officials are aggressively investigating the incident where the 24-year-old recording artist was arrested for assault, TMZ.com reported.

Another source claims that probation is gunning for him, as they are embarrassed by what he has done for the past 2 years and have had bit by now.

It appears that probation department will submit a report to the judge, who will decide whether to revoke his probation. If it happens, then he could be sentenced to prison for as long as 4 years.