Depends on your local police. They may or may not use UHF.
The HT's are not good as 'scanners', actual users do not 'scan' everything, they want radios that stay on ONE channel and receive it well.
Since you don't tell us where you are, we can't look up what you might receive locally.
Just to get it out of the way, do not even THINK of programming them to transmit on any frequency you are not licensed for. Receive only.
Bluntly, for almost all users, a 'real' scanner works better than a commercial HT for 'scanning'. Some people just like to have the official logos.
Update, found your info, you say you are in Queens, New York. No police agency there uses UHF, they're all 800 MHz Trunked, some of them scannable (with the proper scanner), some not.