My gut reaction is no. When I think about it, however, it's far better to prove you're "harmless" without being asked.

For instance, at my credit union, the signs say you may be asked to present your membership ID to the teller. I relieve them of having to ask for my ID by simply showing it to them with every transaction I make.

Doesn't cost me anything and saves them some breath.

If I were to enter an establishment that reserves the right to search my bag, I might very well volunteer it for searching. I have lots of first aid supplies, an Inova XO3, either a SwissTool or a Leatherman Wave, a small crowbar, gloves, and a respirator.

I would explain I was carrying the last three items in light of the London bombings. I'm tall, thin, geeky, nerdy, and I weigh 130 pounds. I'm clearly no threat, so people tend to believe me. Also, I find it difficult to lie. Cub scout oath and all that.

-- Craig