You clearly didn't understand what I said. The article and policy might say "any device", but that doesn't mean that the TSA screeners are actually looking for "any device". It's kind of like traffic laws -- there are tons of them that don't get enforced because doing so would be impractical, inconsistent, and the enforcement agency doesn't have enough bandwidth to actually pursue them. On the site TSA screeners aren't going to look for every data storing device and spend time flagging it or inspecting it. There aren't enough of them to spend that much time on it. They're going to look for the obvious ones, not the marginal ones.