Yet on the whole, the niacin flush is associated with beneficial health effects. Niacin specifically activates the high affinity G-protein coupled receptors, GPR109a and b, which then leads to release of a variety of prostaglandins that results in the flush response.
professional courtesy is something to be given by the off duty officer to an on duty officer not the other way around a working cop may use discretion on minor violations without fear of repercussions this consideration is extended to citizens and certainly can also be extended to off duty cops
In the case of NCOs and soldiers, we address them by their rank because they've earned that rank. Simple courtesy is an important indicator of a person's bearing, discipline, and manners. It is a fact that most people respond positively to genuine politeness and courtesy.