Bureau of Alcohol, Tabacco, Firearms and Explosives (ATF) Special Agent and Certified Fire Investigator Aaron Chaffee will be a guest speaker for the School of Criminal Justice and the student Forensic Science Society at 3:30 p.m. Thursday, Sept. 21 in 337 Law Enforcement Training Center as part this week’s National Forensic Science Week. He will provide an overview of ATF’s Fire and Explosive investigative program to include how forensic resources of the ATF Laboratories, Fire Research Laboratory and National Center for Explosives and Training Research are used to assist investigators.