Most cops started out wanting to be cops, and if they went to college, studied criminal justice or something related to it. I have a master's degree in criminal justice and taught it in colleges for seven years, but my bachelor's degree is in molecular biology. That science education has allowed me to write about technology from the perspective or a practitioner who understands (or can be made to understand) the theory behind what makes the technology work. Most public relations people have their marketing folks talk to police writers about new products. I always ask to speak to "the geek," the engineer or product manager who built the product. I learn a lot more from them, and am able to give my readers a better understanding of the benefits and limits of the technology they are considering for purchase.
Many law enforcement vendors are looking to make the sale to the big agency--the LAPD, NYPD or other organization with thousands of cops. The managers of those agencies have their own tech people to do research for them, and don't read my work. I'm writing for the roughly 15,000 chiefs and sheriffs who have fewer than 25 cops in their department. For those people, *I* am the the tech guy. They depend on me to give them the straight scoop on what is worthwhile and what is crap.