You're suggesting that shop owners use a Howitzer to shoot flies.

Using such technology for this purpose is a massive overkill and prone to abuse.

I already resent some of the tracking techniques used by shops today (i.e abusing my cell phone for their tracking). I hope that some enterprising citizens (I see organizations like the CCC) publish lists of shops employing such technology.

Because I, for one, wil make damn sure that they don't get my business. Not! one! penny!