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Prisoners are free to exercise whatever faith they wish. State sponsored religion is a slippery slope that should be carefully guarded. Our prison facilities must not be used as a state based religious camp but we should preserve a prisoner's free right to exercise their religious faith. In fact, allowing prisoners to exercise their faith can be intrumental toward their rehabilitation and future deterrence.
While these goals and rights are important, the implements or practice of a prisoner's faith must not pose a security risk to the facility or it cannot be permitted as it would pose an overriding safety issue to guards and other inmates. Inmates faith exercises should also not unreasonably interfere with other inmates as it would also pose a security issue.
Please reply if I can help further.