I don't think it's silly, more of an extended field test which might cause some people to put their phones away. Everyone involved is probably thinking it's of

I don't think it's silly, more of an extended field test which might cause some people to put their phones away. Everyone involved is probably thinking it's of marginal benefit at the moment, but the field-test data can be used to develop the tech. Seems perfectly reasonable. The alternative would be to go "big bang" on a half-baked technology which would repeatedly fail to secure convictions. That would be silly.