James Q. Wilson, The Investigators: Managing FBI and Narcotics Agents (Basic Books, 1978).

In the early 1970s, Wilson served as a consultant to the Drug Enforcement Agency and as an informal adviser to Clarence M. Kelley, the director of the Federal Bureau of Investigation from 1973 to 1978. One result of these experiences was The Investigators, an examination of how the DEA and the FBI go about investigating cases and the imperatives and constraints faced by the administrators and operators considering the difficult tasks they are entrusted with.