With WPD, NHCOSO etc. They ask for volunteers from the various departments, the larger the checkpoint, the more the more cooperation. Some checkpoints block off larger roads (College, Market etc.) In order to do one of these, they have to obtain permission from the Clerk Of Court because it must be registered with the County. Drivers license checkpoints, on the other hand, do not require any paperwork of any kind other then a written plan at the agency.