Dozens of countries, including Canada, Mexico, New Zealand, Norway, Turkey and others, allow the police or prison officials to use mobile phone blocker jammer.

Chinese and Indian schools use jammers to stop cheaters. Mexico allows jammers in churches and hospitals. And Pakistan allows jamming in banks and libraries.

Most countries, including the U.S., use jammers to thwart cell phone-triggered bomb attacks against government leaders. When President Obama walked down Pennsylvania Avenue after his inauguration, all cell phones were jammed in the area. The U.S. military uses jammers to stop roadside bomb attacks in Iraq.

In fact, the harsh laws against jammers in the U.S. apply to everyone except federal government officials. Which raises the question: Is that right?

U.S. prisons want to use jammers. So do police. And while we're at it, so do many movie theaters, restaurants and other businesses. Some individuals want to use Gps signal jammer as well.