He is in jail. This is a general statement meaning broadly 'he is not free'. He is in a jail.
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AnonymousI was wondering if in a jail and in a prison are also possible to use in some contextYes. That would be a literal use of the words. "in jail" and "in prison" should be thought of as idioms, i.e., word combinations with a special meaning not necessarily related exactly to the literal meaning of each word in the idiom.