Here is an EXTREMELY good, educational site, with articles and videos about ballistics, crime fighting, weapons detection, explosives detection, etc
Do not make the link hot:
http://www.nlectc.org/virlib/default.asp
Some subjects it covers:
• Biological, Chemical, and Radiological Defense • Biometric Identification
• Commercialization • Communications Interoperability
• Concealed Weapon Detection • Contraband Detection
• Corrections • Crime Mapping
• Critical Incident Technology • Electronic Crime
• Explosives Detection and Remediation • Federal Property
• Firearms • General Publications
• Information Sharing and Analysis • Investigative and Forensic Sciences
• Learning Technology / Education and Training • Less-than-Lethal Incapacitation
• Offender Monitoring / Officer Location • Perimeter Security
• Personal Protection • Pursuit Management
• Restraint Systems • School Safety
• Speech Enhancement • Standards and Testing
• Surveillance • Transportation Infrastructure Security