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Unfortunately, when a person is placed on probation and violates probation, the convicted person can in fact be held in jail until probation violation hearing is set and if it takes more than few days for the hearing to be set, then the convicted person or someone on his/her behalf can in fact contact and retain either private attorney or public defender's office which can file Habeas Corpus petition with the court and the court will review such situation and will take action based on the judicial review.
The main reason that many convicts on probation end up spending some time in jail once probation is violated, is because the does not afford the same level or protection to a convict who is serving probation as part of his/her sentence as it does to someone who is accused / charged with crime, but has not been convicted, so generally, there would not be any legal recourse under similar circumstances and it is very important to for the convict on probation to adhere closely to all the terms of the probation, since the supervising probation officer is basically "holding the key to a jail cell" and can in fact violate probation and throw person on probation in jail, even upon a minor violation.
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