Where can a landlord go to do a legal credit/background check on a potential renter.?

I have several rental applications from potential renters who have filled out information allowing me to do a background/ credit check. I also have thier permission to do so. I am looking for a website service that will alllow me to do a legal check. I do not want anything illegal, it all must be done legally, acurately and as quick as possible. By the way, the location is central Florida.

There are local credit bureaus in most cities. Landlords usually go with one of those for best service (look in your phone book or the internet equivalent). But if you prefer a national service look for something like these guys:

http://www.thelpa.com/

Background Check Companies | Tenant Background Check | Landlord Credit Check