I don't think jammers are the right way to deal with the "loud talkers" problem - they also block emergency calls. What if someone who lives above the restaurant needs an ambulance? What if someone in the restaurant gets an emergency call from their spouse?
Fair point, I don't know how these issues are addressed with the current technology .. but I do know, these jammers are out there and can be deployed by those who want a cell-phone free environment. Every location that I've seen them in has a big sign, usually, on the front door that says "YOUR CELL PHONE WILL NOT WORK IN HERE", or something to that effect .. its up to the owner of the technology to work out what to do in that case, I guess.
