Radar detectors are legal in many cities and states in the United States. But this does not mean that radar detector units are legal in all of the states in the US.
The demand for truckers is very high, and it is relatively easy for most qualified truckers to find steady work. Nonetheless, some researchers estimate that as many of 15% of drivers, even those with extensive experience, get disqualified when applying for a trucking position. Why are so many truckers getting turned away if the need for trucker is so high? It all has to do with being organized.