Whats next dating sites?

When you go out to get a job you are often confronted with the background checks services. But have you ever thought about how this service could help people on dating sites? If you could enter a site knowing that all the people who signed up had a background check and psych evaluation done then you could relax more knowing your not going to be going on a date with a hardened criminal or someone who is simply unstable. Their are sites that do the psych evaluation through a series of about 100 questions but wouldn’t a background check be cool?