I feel confident in saying some dispatchers have relabeled SIRS on their console to "MUTE," lol.
Why would they remove the radio? Alot of local agencies have removed their SIRS radios since they have the newer "links" or talkgroups, conserves space in the vehicle and one less antenna. However, VSP, DGIF, DOC, and the like still have SIRS mobiles, usually a Motorola CDM750, mainly due to interoperability requirements for grants, but/and its there just in case. If you have an older scanner just sitting around, you can put it to use like I did with an older BC-996T, mine is dedicated to interop monitoring with SIRS and even the old favorite 39.50, and everyone once in awhile it actually hears traffic. Personally I think the SIRS board (if they still have that around) should consider a move up to highband, like 155.475, 155.370, or even 154.665.