I always make sure that this is the case by taking the covers off and pulling them out a tad a little bit. You can see what they've done here, I hope you can see it, is they have jumped the ground wire which is the ground connection which is this green screw there. They've used a little wire and jumped it to the neutral and what that does is it makes the tester think that the outlet is in fact grounded when it is not. This is an improper way of grounding an outlet... … Read More...