When driving to the call, start conducting the breathing exercise. Despite the noise of the sirens, the clatter on the police radio, and the expectation of trouble, you may find the slower breathing helps bring about a calmer mindset that allows you to operate your cruiser better and plan for a focused response to the call. Once on scene, the high energy combined with clear thinking you've attained using controlled breathing will allow you to address the situation in the safest and most professional manner.
As these sudden heart pounding responses can put a physical strain, sometimes unrecognized, on you, it is useful to conduct the breathing exercise after the call is over. Even if you think you're fine and feel OK, it is a good habit to practice this exercise afterward as well.
Stay Cool on the Stand
As you know, a police officer's stress is not limited to the street. Internal department environments and inter-agency politics can put a strain on you both mentally and physically. If you have to explain your actions on a call or how you conducted an investigation, you may find yourself under particular stress. They may be worried that they did something wrong or they did in fact make a mistake and become concerned about how much trouble they are in for that error.
Prior to being questioned or having to explain your actions, conduct the breathing technique. A relaxed mind may help you recall more precisely what took place and explain it in a calm and deliberate fashion.