It's true. Things invisible to the human eye can often be seen under a special UV light, which comes in handy for both scientists when they do their research, and detectives when they are working to solve their crimes.

Batman himself often uses his arsenal of tech, which includes UV sensors to find hidden clues that even the most seasonsed investigators may overlook.  But not to worry... the world's greatest detective employs all all the lates ttecniques and equipment to keep villains worried!