Effectively? The fact that it is a mobile device. You can do it, but it is anything but ideal and people are prone to take shortcuts, particularly when someth

Effectively? The fact that it is a mobile device. You can do it, but it is anything but ideal and people are prone to take shortcuts, particularly when something inconvenient and based on the 'honor system' appears. I'm trying to think of a good analogy here... "It is like allowing people to use 'water wings' and pool noodles in the deep end of a pool", if that makes any sense.