Lindsay Lohan's probation officer thinks she's a spoiled brat and asked the court to lock her up in jail -- because she wouldn't change her partying ways.
The probation report which was submitted to Judge Stephanie Sautner ... indicates Lindsay failed an alcohol test on June 13 -- the day after she was seen partying on her rooftop deck in Venice, Ca.
It also states Lindsay refused two prior narcotics tests -- on May 31 and June 2 -- and passed another on June 9.
LiLo's probation officer writes, "The defendant's behavior indicates she is not attempting to change. It appears that the defendant does not view being on the electronic monitoring program as a privilege.
The report goes on to recommend Lindsay should serve "suitable time in custody."
Of course, we now know Lindsay should NOT have been tested at all ... since the order requiring testing expired on February 25.