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.
A radar gun, as defined by the Merriam-Webster dictionary, is a handheld device that uses radar to measure the speed of a moving object.. This gun measures the speed of a ball in sports such as tennis and baseball. Police officers also use this device to track the speed of moving vehicles on the road.