Desc: Wrist Lock: The Martial Arts' Influence on Police Use of Force: Directed by Jason Harney. With Jon Gentile, Tony Blauer, Betsy Brantner Smith, Jonathan Sheinberg. Join Master Martial Artist and retired Police Sergeant Jon Gentile, along with a group of high level Martial Artists and police trainers, on a journey to discover how the Marital Arts has influenced police use of force tactics, and how training can be improved in a manner that will create proficient and physically fit law enforcement officers capable of the performance and decision making necessary to have reasonable use of force outcomes consistently.