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I am new to scanning so apologize for newbie questions in advance.

In the RR DB there is a public safety system for chicago under
Illinois/Cook/County Systems/Chicago Public Safety & Services
that lists individual police units e.g Detectives(TGID=29xx, Gang=18xx) etc.

Is that system in use or are those now under the City Wide channels?
I appreciate the help.
Bob.
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