Synopsis
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For reasons unimportant to the question all divine/infernal beings and deities took a hiatus from interacting with the earth in the dark ages. For reasons equally obscure they are back and busier than ever. Law enforcement, corrections, mental health staff, and the US legal system now must deal with a massive influx of demonic and paranormal related crime (every cultures entities and deities are now real with predictable chaotic results). In my prior question I attempted to find a plausible method for field testing to ascertain the difference between demonic possession and mental illness so that authorities could provide the adequate response. 

The Situation
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So our overworked and underpaid law enforcement get a man in booking exhibiting signs of possible possession. The field test is administered and consists of blind tests that an insane person could not react to properly. He exhibits signs of discomfort when touched within the presence of a holy icon despite being held in a position where he could not possibly know the difference between the object and any other. The man begins speaking of personal details of jail staff that he could not possibly know without the presence of paranormal ability. He is determined to be possessed by a low level demonic entity of the Judeo/christian variety by testing his blind reaction to contact with various religion's holy icons. 

The Dilemma
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At this point detention staff are calling for a mobile tactical priesthood squad to arrive and perform an exorcism when the demon within the man demands that he be allowed to speak to a lawyer. Furthermore, he claims that the victim was a willing host and that forced contact with holy icons is painful to both himself and the host and violates his and his host's civil rights as it constitutes cruel and unusual punishment. 

The question
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Is this claim valid under US law? Can this Demon claim that he is afforded civil rights?