D.B.
With Mamapedia being a national forum, I think you're unlikely to find much help here. I have quite a few friends who do Reiki, either alone or in conduction with other therapies, and they have to be licensed. I think you should contact your state's licensing bureau to get a list of approved facilities or independent instructors. Since you say you want to "learn" it rather than just experience it, I assume you want more than just someone licensed to perform Reiki, but someone to certify you. Have you visited any practitioners already? If so, I'd start with them to find out where they studied and whether they recommend that agency/practitioner.
I think you actually can get some decent feedback by using your own social media contacts about who they used/recommend in your own area. You can't just go on those recommendations, of course, but it's a start.