People who live or routinely work around radars have expressed concerns about long term adverse effects of these systems on health, including cancer, reproductive malfunction, cataracts and changes in behavior or development of children. A recent example has been the alleged increase in testicular cancer in police using speed control police hand-held radar guns.
It's important to distinguish between real and not real dangers that radar guns pose.

The power that radar systems emit range from a few milliwatts (traffic radar guns) to many kilowatts (large space tracking radars). So, it means that police radar guns are not considered hazardous to health to the general public because its average output power is very low.