Contact your local police department & have them send one of their officers to learn about this for your area....
"Robbery/Theft Investigations Seminar for Law Enforcement
Donald E.Stephens Convention Center Room #5 5555 N. River Rd., Rosemont, IL 60018
Numismatic Crimes ROBBERY/THEFT INVESTIGATIONS SEMINAR (Related to Rare Coins, Paper Money, Silver, Gold and Precious metals) LAW ENFORCEMENT ONLY TUITION: FREE Date: August 12, 2015 from 8:30am-4:30pm. Includes all training materials and a certificate of completion. (Accredited by Texas Commission on Law Enforcement)
Seminar Objective: To provide participants with the fundamental investigative techniques and resources, knowledge, and understanding to respond effectively to the complex challenges encountered during the investigation of crimes involving rare coins, paper money, gold and silver"
http://www.numismaticcrimes.org/?q=node/501