Are you writing police mysteries thrillers? Want to get it right? I do, too, though I may have an advantage, having been a police officer for 30 years. Although the home setting for my books is the San Francisco PD, sometimes protagonists must seek the help of other police or federal agencies. This presents a problem, as not all law enforcement agencies conduct investigations the same way. Each agency has their own set of procedures and though general investigative protocols are the same, there are distinct differences in how they conduct an investigation. Evidence collection, interrogations, interviews, use-of-force issues, and so on. The list is long. Research is critical. Your…