From What I'm Seeing On What You're Describing And From This Link On Where You Said It Was: >
St. Louis County, Missouri (MO) Scanner Frequencies and Radio Frequency Reference, < It appears you are right, They are on MURS Channels, Otherwise it will be full VHF High channels if not, Either way, All of these can be monitored from a regular old scanner from radio shack etc. But as n5ims said, if it's encrypted, Legally you will not be able to monitor it due to Law. Hope This Helps.