In case of the inability or refusal to act on the part of the constable or a duly appointed deputy constable because of relationship, sickness, or from other causes in civil suits, and in case of the execution of conservatory writs in civil suits, the justices of the peace may employ either the sheriff or his deputy or appoint a special deputy constable to execute all orders, citations, summons, seizures, and writs.
La. R.S. § 13:3477