What are the duties of a Texas Constable?
In Texas, constables and their deputies are fully empowered peace officers with county-wide jurisdiction and thus, may legally exercise their authority in any precinct within their county. Constables and their deputies may serve civil process in any precinct in their county and any contiguous county and can serve arrest warrants anywhere in the state. The duties of a Texas constable generally include providing bailiffs for the justice of the peace court(s) within their precinct, conducting investigations, issuing traffic citations and serving process issued there and from any other court. Constables may make a warrantless arrest for any offense committed in their presence or view anywhere in Texas.
The Constable's authority considerably overlaps with that of the County Sheriff, especially with respect to serving civil documents as well as criminal warrants.
On a personal note, I believe the Office of Constable is very important because it is one of only two law enforcement positions that answer directly to the citizens who elect him or her. All others are appointed by government and therefore your constable serves you, the citizen.