Since 1961 local police in Pennsylvania have not been allowed to use radar for traffic enforcement. Currently only PA State police are allowed to use radar, local police must use timing systems to enforce speed (time consuming and labor intensive -- compared to using radar).
Recently the state Chiefs of Police Association is lobbying to allow local municipalities to use radar. State Police have also endorsed local police using radar, after decades of opposing it.
The main concerns of oppoents are abuse (revenue generators), and lack of officer training. Note the POLICE TRAFFIC RADAR HANDBOOK has everything and more an officer needs to know to properly operate radar.
CopRadar