After all, facial features and fingerprints are used for identification purposes, and Ralph is the one main character on this show who can change his appearance at will, rendering both recognition and print-dusting useless.
One assumes he’ll have to use some questionable appearance-swapping tactics in order to solve some cases in Season 5.
Ralph is putting his face front and left-of-center alongside a big fingerprint on the billboard, which was shared by The Flash Podcast on Twitter.
There’s nothing out of the ordinary about those elements in general, but in Ralph’s specific case, it’s interesting.