Okay, as a peace officer you're going to be placed into situations which require a decent knowledge of some kind of grappling.
See if you can find someone teaching san shou kuai jiao, more often advertised as simply san shou or sanda.
Some JKD academies teach chin na techniques, and these techniques can be very useful when you're the initiating officer in a pig-pile.
Brazilian jui-jitsu/Muay Thai/Mixed Martial Art/Shootfighting/Submission/whatever schools are popping up like weeds. Good schools will teach you invaluable lessons, but you have to make sure that you have a good and reputable school.
Taiho-jitsu is kind of rare, but if you're near a big metropolis that has a taiho-jitsu dojo, I'm told the training is police-orientated and very good.
Krav maga is police-orientated, but just like the BJJ/Muay Thai schools, krav maga schools are popping up everywhere and some of them are worse than terrible. Caveat emptor.
Hope that gives you somewhere to start and congratualtions on your new career.
LawDog