Some areas of the country do throw the weight in youth competitions. If you or one of your athletes is scheduled to throw in a youth meet, you will need to contact the meet director and check what size weight they will be using for the age group.
In the sense of performing as designed, most radar detectors do detect the presence of police radar in the immediate vicinity of a speeding vehicle. Whether or not that information will actually prevent a driver from receiving a speeding ticket remains to be seen, however.
Radar. Radar, which stands for Radio Detection and Ranging, works by transmitting electromagnetic waves that bounce off of a moving object. After the wave is reflected by an object, it changes frequency, and the radar machine interprets the frequency in a calculation of speed.