weapons sold as gun stores. some include gun show sales for most weapons. the majority do not. a loophole some lawmakers hope to close. >> background checks for all firearm sales, not just by licensed dealers, but also at gun shows, private sales. >> reporter: but the system remains gross lee incomplete according to a federal audit last year missing millions of court record identifying the mentally ill and drug users, which explains while 21 states, including california do their own more thorough checks and require waiting period from three days to six months to get a gun or gun permit. 29 states rely solely on the f.b.i. >> is it hard for a person with a criminal record to get a gun? >> no. >> reporter: not that any of this matters to those who don't follow the law. >> where do crime guns come from? >> pretty much the streets. >> the streets. >> the streets. i'd say 95% off the streets, the crime guns. >> reporter: they buy off the