In this paper we study the relationship between costs, input prices and activity levels in a sample of approximately thirty medium sized city police departments for the years 1968, 69, 71, and 73. Our interest lies in determining the functional structure of law enforcement production technology.
Heineke, John, and M. N. Darrough. "Law Enforcement Agencies as Multiproduct Firms: An Econometric Investigation of Production Costs." Public Finance 34.2 (1979): 176-95.