The most severe restrictions to the general public are imposed within a 20-mile (32 km) radius of the Green Bank Observatory.[5] The Observatory polices the area actively for devices emitting excessive electromagnetic radiation such as microwave ovens, Wi-Fi access points and faulty electrical equipment and request citizens discontinue their usage. It does not have enforcement power[6] (although the FCC can impose a fine of $50 on violators[7]), but will work with residents to find solutions.