At the time of making the return, one must also produce the person on whose behalf the writ of habeas corpus was sued out, according to the command of the writ, and the original warrant, writ or other written authority under which he was detained; but, if from sickness or infirmity the party cannot be produced without danger, that fact must be stated in the return, verified by oath and, if required, established by other sufficient evidence.
Ala. Code § 15-21-18 (1975)