What to do with the potentially Riddler-Allied Cop?

When walking through the GCPD, I found this officer, highlighted in green (as the thugs you can interrogate for Riddler Intel are).

I can't beat him up, or seemingly report him in any way. Is there anything I can do with him, or is this likely just a glitch of some kind?

Solution 1:

He is, in fact, a Riddler Informant. Hit the "Interrogate" button you'd usually use on Riddler Informants. (RMB, Y, Δ depending on platform, as referenced in the other answer.)

Batman will grab him, and the other two cops will draw their weapons. Quickly, though the guy will confess to being an informant and give you the goods.

The other two officers reference this event if you talk to them afterwards, and will apologize for drawing their weapons on Batman.

Solution 2:

You could try pressing Counter, as this generally interrogates the informant.

Counter, by default is:
PC: RMB
PS4: Δ
XB1: Y