Because the Chiefs of Police for the DU-COMM and ACDC entities request that it be permanently deployed on all law enforcement agencies' talk groups with the exception of Fire/EMS systems.
Fire personnel will have the capability to dial into the law enforcement agencies, and vice-versa.
From reliable sources, I heard that a purchase order for $36 million dollars was approved by the DuPage County ETSB which supplies, programs, and services all portable & mobile radios.
DU-COMM and ACDC have taken over most of the other radio systems of their customers, such as public works, and other municipalities. Of course, there are some exceptions.
I said the same thing (not verbatim) in my response I left at 11:38 hours last evening:
" This is something the Chiefs of Police wanted, so DU-COMM is complying with their programming requests. In case you didn't know, DU-COMM programs all the APX radios for DuPage towns, villages, cities, and Fire districts including the ACDC dispatched towns. DuPage ETSB does not service the DuPage sections of Naperville and Aurora, hence, they obtain their own radios."