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.
Generally, with a radar detector, the driver can slow down once the detector signals the driver and not risk the chance of receiving a speeding ticket. Radar detectors can only detect Doppler radar-based units and do not detect piezo sensors, VASCAR technology, or ANPR. Radar detectors are illegal in certain areas and can result in a fine or confiscation of device. Currently, radar detectors are illegal in Virginia, Washington DC, and all military bases.