Not able to be successfully prosecuted. (adjective)
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Use "unprosecutable" in a sentence
"But the argument he presents is certainly in tension with the general idea of preventive detention, since all preventive detention is predicated on the idea of unprosecutable "dangerousness," which Lederman rejects as a "constitutionally valid ground" for "noncriminal detention.""
""unprosecutable" because of what has been done with him during the interrogation."
"Definition of property rights will not cancel the comparative advantage of unprosecutable violation of said property rights -- his avowal of the still present need court adjucation fails."