The Kawasaki KZ1000P Police was very successful. Then starting around the late '90s (IIRC) the CHP and a bunch of other agencies adopted the BMW R1100RT-P, which was followed by the 1150 and 1200. Kawasaki returned to the law enforcement market a few years ago with the Concours 14 and Honda offers the ST1300. I hear both the Kawasaki and Honda are much cheaper to repair and maintain than the BMWs, and they have become pretty popular. There are still some agencies who use Harleys.