I run across people from time to time that gawk and tell me Im breaking the law. I ask them which one exactly am I breaking and they proceed to give me the boyscout rule of no longer than the width of your hand... At which point their ignorance becomes painfully and abundantly clear. But I can't blame them really, they don't carry anything more than a pair of nail clippers and just don't know. I have even had an on duty police officer quote me this very "rule of thumb" as law. BUT, to this day, I have never had a knife taken from me.
Most of the time though, the Mili stays tucked in the pocket and a smaller matter separator takes the chore.