Police / fire and other services use a (link ->) coded language over the radio. For example 10-4 means "OK". A 10-20 code means "location". So the detective is asking if they have a reported location for the suspect.
A Stars, are you old enough to remember the CB craze in the 70s? "What's your 20?" "Got a smokey in plain brown wrapper." My memory has faded over time - I don't remember too many of the others.