The TC does it all the time. Just before the "body found" incident DeRosa sent out (at least) a tweet regarding a roll-over incident on the TCH as information was being relayed over the scanner. One of the details (at that instance, anyways) DeRosa had reported would have only been known to someone listening to the scanner.
Naturally, I'm skeptical about this. Could that detail not have been phoned in to the TC by an eyewitness? Such a call could even be made just as quickly as call the police to report the incident.
Also, do you have more examples of the TC doing this "all the time"?