If your son has successfully completed probation he should be given a certificate of completion and/or notice from the court or his Probation Officer notifying him of this. If the police continue to detain and search him, it is likely because he is NOT off probation. Or, the Probation Department has neglected to modify his status reflecting successful completion of probation.
It is possible that yur son is not telling you the whole truth.
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If it is over and he checks your son's name, it will not come back with a hit on any probation status with search conditions ... assuming the records have been updated by the Probation Department.
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Therefore ... the court record you see online is NOT the complete record.
This is your SON's issue, NOT yours. Your SON can speak to his attorney, his Probation Officer, or anyone at the Probation Department and try and find out the status of his probation. It is HIS issue, not yours.

