STD testing for gangbang

How do you get verified STD tests?

The wife wants me to arrange a bareback gangbang. I'd like to make this as safe as possible. Obviously condoms would be safer but she wants bareback and is a total cumslut.

How do I go about getting a bunch of guys STD tested and know for certain the results are real and recent? Surely there's a system in place for this right? Doesn't the porn industry do something like this?

For the curious the gangbang will be in Houston, TX as soon as I can find enough clean hung studs to fill a hotel room.