A well worded note to the boss man that you were told this.....but the statute states this........may generate a Memo to resolve any confusion, if there was any.
Not a bad idea, and you don't even need to give specifics and flame the individual officer...just state that you were pulled over by one of his deputies and it appears some refresher training is required on the SDA notification clause.
Remember the crap sandwich method of presentation, it avoids defensive/hostile reactions:
(Bread) Dear so-and-so, I'm proud of your department and officers etc....
(Crap layer) By the way, the other day X happened and I think it needs to be addressed.
(More bread for complete crap sandwich) Thanks again for your dedication and sacrifice for our community etc....