(a) Sheriffs and constables may serve either civil or criminal process, anywhere within the State and returnable to any court.
(b) Sheriffs and constables shall not be subject to civil or criminal liability for unlawful trespass in serving either civil or criminal process, including citations, summons, subpoenas, warrants, and other court orders, provided the scope of their entrance onto the property of another is no more than necessary to effectuate the service of process.