Title 24, Chapter 10, Section 23
A subpoena may be served by any sheriff, by his deputy, or by any
other person not less than 18 years of age. Proof may be shown by
return or certificate endorsed on a copy of the subpoena. Subpoenas
may also be served by registered or certified mail or statutory
overnight delivery, and the return receipt shall constitute
prima-facie proof of service. Service upon a party may be made by
serving his counsel of record.