Coppell requires solicitors to obtain a permit from the police department before going door to door. Grady Wallace, owner of RoofKing LLC, spent $250 to get permits for his 10 employees.

This year, organizers hope to raise at least $25,000 for Metroplex C.O.P.S. (Concerns of Police Survivors), a charity that "Steps in when an officer is killed in the line of duty," Said Coppell ...