Texas Rules of Civil Procedure
Rule 176.5
1. Manner of Service. A subpoena may be served at any place within the State
of Texas by any sheriff or constable of the State of Texas, or any person who is
not a party and is 18 years of age or older. A subpoena must be served by
delivering a copy to the witness and tendering to that person any fees required
by law. If the witness is a party and is represented by an attorney of record in
the proceeding, the subpoena may be served on the witness's attorney of
record.
2. Proof of Service. Proof of service must be made by filing either:
the witness's signed written memorandum attached to the subpoena showing
that the witness accepted the subpoena; or
a statement by the person who made the service stating the date, time, and
manner of service, and the name of the person served.
Federal Rules of Civil Procedure
Rule 4. Summons
(c)(2) Service may be effected by any person who is not a party and who is at
least 18 years of age.
Rule 45. Subpoena
(b)(1) A subpoena may be served by any person who is not a party and is not
less than 18 years of age.