obligated to, provide for the citation and petition to be served by any other law enforcement officer, including an off-duty officer with appropriate identification, that has received appropriate training in the service of process, eviction procedures, and the execution of writs, as determined by the Texas Commission on Law Enforcement.
(g) The court:
(1) shall, subject to this subsection, hold the trial of an eviction suit on a date that is not earlier than the 10th day or later than the 21st day after the date the petition is filed;
(2) may not hold the trial on a date that is earlier than the fourth day after the date the tenant is served with the petition; and
(3) may not postpone the date of a trial for more than seven days unless the parties agree to the postponement in writing.