The return must be signed and verified by the person making it, who shall state: First. The authority or cause of restraint of the party in his custody.Second. If the authority be in writing, he shall return a copy and produce the original on the hearing.Third. If he has had the party in his custody or under his restraint, and has transferred him to another, he shall state to whom, the time, place and cause of the transfer.He shall produce the party on the hearing, unless prevented by sickness or infirmity, which must be shown in the return.R.L. 1910, § 4890.
Oklahoma Legal Code