Looking to do a background check for your volunteers? Talk with your Insurance Underwriter and ask them for their advice.
If you are looking for a vendor, go to your favorite search engine and type in "background check for church volunteers" or click on one of the following links. (The Texas District is not compensated by any company to provide this list and is not endorsing any company listed below.)

Protect My Ministry is an employment and volunteer background screening company established to assist churches, schools and other faith-based organizations in implementing and maintaining a thorough background screening process.
other agencies
Shepherd's Watch
Intelius Screen Solutions
Oxford Document Management Company