Problem with CSI:Senses game

Okay, maybe I'm just being a bit blonde, but I just sat down to play the CSI:Senses game and I was using my UV light to check the answers to the preliminary questions at the start of the game. The thing is, the UV light isn't picking up the answers on the case file.

Am I just being really slow or could there be something wrng with my cards and they forgot to write the answers on them in UV writing?
 
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