Does anyone know the name of some of vendors the regional airlines use to perform their background checks?

I know ChoicePoint may be one of them. Does anyone know which airlines use them or which vendor a particular regional uses?

There are a couple of things I have heard about these checks. One is that they actually go back only 7 years. This may be due to some law which prohibits the use of checks for employment beyond a certain period of time. Can anyone confirm this? Also, I was also told that only misdemeanors and felonies show up.

Basically, I'm just trying to ascertain what if anything will show up and what I can openly admit or not claim by running a check on myself through thes ame vendor the regionals use.

Thanks.