Salt Lake City Police Department

• March 1983 SWAT magazine article “How Close Is Too Close?”
• Tueller Drill is a self-defense training exercise 
• 21 Foot Rule – an attacker with a knife could cover 21 feet  before you can draw
• Armed Citizens’ Legal Defense Network, Inc.

https://armedcitizensnetwork.org/the-tueller-drill-revisited

• Glock Armorer Instructor