Probation is a form of criminal sanction--like prison--and in many cases the PO does not need a warrant for areas where the probationer has joint or total control over an area. Federal probationers have limited protection under the 4th Amendment of the United States Constitution. His probation documents should define his rights--your home is NOT a safe haven from those restrictions. The thinking is that if he was still in prison, he would have no safe place to hide his contraband or have total freedom of movement and since he is still under criminal sanction while on probation—he should have no safe place to hide contraband or have total freedom of movement.
Best option to avoid the scrutiny in the future, do not allow you son in your home.
Best option given that you want to see your son: make yourself aware of all the consequences of his presence in your home--which include warrantless searches.
That said, I am NOT a DE attorney. If you are charged with any crime, immediately contact a DE criminal defense attorney. Best of luck to you and your son.
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Under these circumstances, I would say yes. The son is allowed there to make calls there.
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