Brooke Mueller Faces Jail For Testing Dirty

12/10/2012 5:00 PM PST

Brooke Mueller Faces Jail For Drinking Alcohol While On Probation

Brooke Mueller is in hot water because she violated her probation by drinking alcohol ... TMZ has learned.

As you know ... Brooke pled guilty to felony drug possession in May and was placed on probation for 1 year. Part of the deal -- she was ordered not to drink alcohol.

Sources very close to Brooke and familiar with the situation tell TMZ ... when Brooke was hospitalized last week for OD'ing on drugs (Adderall), her blood was tested and alcohol was present in her system.

It's unclear if prosecutors will go to court to yank Brooke off probation and into the pokey. One thing that could help her -- the alcohol level in her blood was very low.