Your plate is a way to access info about the registered owner, same as your DL. This leads to all the info on computer databases...Prime, CPIC, FRO etc. If you have had 3 - 215 suspensions, to me that means you are a problem drinker who just doesn't get it. I would definitely be checking you out to see if you are impaired and driving this time too.
Getting caught three times, to Police, means you are a danger to yourself and others. Many times a 215 is given instead of processing a driver for impaired, for a number of reasons. What it obviously did not say clearly enough to you, is that you had/have a problem that you are choosing to ignore.