there are things like OSCP and CISSP which require a background check and sponsor.
there is a reason they are popular for security roles.
that's not the same as a white-hat license but it shows that you registered, that you made it clear where you're at, and that you've had some minimum ethical and professional training.
Then there would be some sort of evidence the guy was a "good guy". Like when a cop shoots your dog and suffers no consequences.