I have 30 years of experience, and specialize in the field of police and corrections practices with specific knowledge in the areas of use of force and excessive force; 4th, 8th & 14th Amendment cases; and private security. I have published on such topics as criminal investigations, laws of arrest, search and seizure, use of force, gangs, prostitution, excessive force, in-custody death, restraints, OC pepper spray, firearms, self-defense, excited and agitated delirium, and “suicide by cop,” shooting psychology and physiology, child abuse, vehicle pursuits, internal affairs investigations, and private security. I have testified 90 times on topics such as excessive force, in-custody death, taser, restraints, OC pepper spray, firearms, self-defense, excited and agitated delirium, criminal investigations, laws of arrest, “suicide by cop,” shooting psychology and physiology, child abuse, vehicle pursuits, internal affairs investigations, and private security.