Secret Service is considering airport-style metal detectors and screening for anyone wanting to get within three blocks of the White House. Why? Because a fellow last week jumped the fence and got inside the front door undeterred. Which is odd because the front door is supposed to be locked, attack dogs were supposed to be released, and Secret Service was supposed to interview people who loiter near the fence for days or weeks, as this man did. So you have three protection systems in place, and none of them are followed. Why add a fourth layer of security instead of making sure the first three work?