I wouldn't know if the proof of testing was legit. I don't know how hard it would be to fake that. Test one plant send another plant to the person with the other plant's certificate? I tend to take people at their word but do lots of watching before I would order something. I would stick to strains that were not super rare or expensive so nobody wants to rip you off on it. I have been into seeds lately. I started with seeds, went to clones and now back to seeds for a spell.