victor - 8:23 am on Jul 30, 2005 (gmt 0)

But it would help detect one class of Blackhats: those who tell the truth.

Admittedly, there may be few of those. But it is the same principle as the one used by governments across the world for visa applications. You know the forms that say: "Are you trying to enter our country to commit genocide or terrorism?"

Catches me out every time.