(a) Returns.--In a county of the sixth, seventh or eighth class, a constable is not required to make a return, if required by law, to the court of common pleas if the constable has no information to impart in the return.
(b) Appearance.--A court may summon a constable to appear before it and direct the constable to investigate a complaint of a violation of law or of a condition which a constable is required to report to the court and to make a report of his investigation.