Generally speaking, there are certain restrictions even in jurisdictions that allow the use of scanners and radar devices. In particular, scanners can occasionally pick up signals such as private cell phones, creating situations that breach privacy laws. According to most restrictions, it is illegal to own, operate, or sell scanners that are capable of listening in on cell phones or wireless home phones. As breaching cell phone privacy is considered a federal law, the act itself is considered illegal across the United States.
For many jurisdictions, it is also illegal to break into encrypted channels to listen in on information that is not supposed to be available to the public. This means that those listening in for police information in order to help them achieve a criminal end, such as speeding, are often breaking multiple laws.
For more information concerning the laws that govern device use in automobiles and how these devices can factor into personal injury cases, contact a car accident attorney.
The National Weather Service is responsible for keeping track of the weather patterns, trends and current conditions in the United States. To do so, there is a large network of National Weather Service radars that help gather this information. From the radar images, data is interpreted and updated constantly to keep all information current.
Experts whose specialty is to interpret the data monitor the National Weather Service radars. They then publish some of their images and findings on their website and in other media, such as radio and television. All these avenues serve to help us understand the weather conditions and patterns in our own backyards.