[keithg]

Presumably citizens are allowed because they don't have the power to charge & convict you of some alleged crime. If the citizen's imagery were somehow brought into a legal matter, then it would be up to the judge to determine its legality. Conversely and unfortunately, law enforcement and government seem to enjoy a defacto legality until someone says otherwise. By limiting their use of this technology, hopefully it mitigates the defacto and clandestine nature of it, bringing it at least to a level of awareness during legal proceedings.