At least for me, this is a very strange definition of trust. So what happens now that he's shown he can figure out at least one of your testing schemes? Personally, hearing that he did not touch the gun or report it because he knew you were testing him is unsettling. If your methods were working he should have responded "I did not touch it because it is unsafe to do so" or something along those lines, but instead he did not touch it simply because he knew you were testing him. This is how I would handle the situation, instead of testing my own kid over and over and possibly messing up his understanding of how to trust other people. But to each his own, and only time can tell how your experiments on your child will work out. I hope for your sake you review every minute of footage you get each day, because otherwise there are some wholly obvious ways your kid could get you into a lot of trouble should he decide being watched all the time is not appropriate. He's already proven himself to be quite clever.