Are there any really free data bases available to do a background check on a person who is also a corporation in Oklahoma?

We have had "good" luck with Criminal Searches - FREE criminal searches on anyone it was good for GA, had most things in MO and was OK in some other places.
Now on the other hand in some areas it proved not to have most info for some states,

You want to check with the State Attorneys General office, also check with the local BBB in the city where the business and person is located.