PSP fleet currently has Whelen and they use Trio modules on corners that do R/W/B so it can alternate red/blue on slide 3 and do white for scene and alley lights , local departments vary the next town over from me got a new PIU and got a “good deal” on Federal Pathfinder siren and lighting system ( chinesium baked in ) another department really cheaped out and went code 3 , I have seen some crazy shit on K-9 units running blue ( they haven’t caught shit from homeland YET but rest assured it is coming ) randomly police and fire departments will get wild hairs up there ass and defy there own state laws and lighting conventions , departments are like individuals and try to slide things by and see if they can get away with it ,they get caught and it costs taxpayers stupid money ( back in the early 90’s I know a department that purchased and issued Uzi sub machine gun to each officer , ATF shut that down and confiscated every weapon before anybody got hurt ) blue and white is just stupid game playing risk taking by odd ball departments , as I don’t what agencies cars maybe involved , nothing is a certainty , I have shouted out to agencies that unfit emergency vehicles asking if anybody has done any blue white only but so far nobody in NY,NJ , or PA has built any that I know , if I find anything specific I will update you such as who built them and for who , I know guys from Long Island to Long Beach . There is also the possibility of malfunction or some DIY idiot hacking the brain and not knowing what there doing , that happens a lot , most of the major manufacturers have an encryption lock option and it prevents DIY tampering or corrupting the programming . Since programmable digital flashers you literally program what each LED can flash and when . There is a company in Texas called Feniex that markets a 4 color LED light head unfortunately they are very low quality ,and flawed versions of products get discontinued/orphaned by this company almost monthly .