[JeffAtlanta]

It must be very expensive to produce them. Otherwise, I cannot understand why they aren't ubiquitous in discount chains. You'd sell a million of them in no time.

I've thought about that too. I think the problem is the huge legal liability that such a device would carry. If it reported that a person was .07 and then later the person was in an accident and blew .08 then anyone hurt in that accident would go after then device maker as well.

[mysterio]

Just get it within +/- .01 or so and put the disclaimer right there on the box.

The cops’ devices have a margin of error in that range, and they stand up just fine in court.