Two weeks ago I traveled in the US and after the scan they first handed me my own computer and then a minute later someone else's MacBook Pro. I said that the Mac isn't mine, and you know what, they didn't believe me. I had to tell them several times that I don't own a Mac and I had to show them that I had already received my own computer. I think they didn't want to look for the owner and just wanted to get rid of the damn thing. I wouldn't be surprised if some people were tempted to give in and say "ok, yes, I admit it, this expensive-looking MacBook is mine". Very careless of the TSA to handle people's belongings this way.