I've been reading posts at various newsgroups for the past couple weeks. I've heard some good things about the BCT-12 scanner. Most people say it's a great addition to a good radar detector. It has a HWY PATROL alert that is triggered off HP radio freqs for any state...pre-programmed.
They are the size of a RD and portable. But Uniden doesn't make 'em anymore. The only place I've seen 'em is Ebay. I bought one. I'll try it out for a week or so and post back.