@Dillon

"Are they so thick that they couldn't give a reasonable description to a police sketch artist?"

This has nothing with being thick - it has to do with facial recognition and memory. I, for one, make a very good living as an IT analyst which requires me to have a pretty lively brain... but I dread ever having to describe someone to a sketch-artist, especially someone whom I'd have only met briefly. I am *terrible* at remembering people's faces... I'll recognise them once I see them, but ask me to describe them from memory? <shudder>