The high end market understands the criticality of Surveillance Detection (SD), they understand that in many of the environments they work in surveillance detection is not just the best protection; it may be the only protection. Also SD is not new – contrary to some beliefs the Personal Protection industry did not start on Sept. 11 2001. These are a series of articles by practitioners Joe Autera, Larry Side, and me that have been involved with SD for decades – both operational and training.
http://www.vehicledynamics.net/articles/see_through_enemy_eyes.html
https://securitydriver.com/05/roadside-bombs-and-surveillance-detection/
https://securitydriver.com/09/surveillance-detection-and-driving/