As for future authorized users, the trick will be establishing criteria for what amounts to turning off every wireless device in a specific radius, be it a prison, public event, or suspected explosive device.

Where jamming may be used constantly, such as near a prison, I'd want to see signs posted so the public knows cellular 911 is not available. Where jammers are used in public gatherings, there should be announcements and, ideally, enough police so that if there's something to report there is a cop nearby to report it to.

There isn't enough space to fully discuss all the issues involved, but I hope you now understand the stakes involved and why I believe cellular jamming should be another tool given to law enforcement as they strive to protect us from evil.