Allow killers/criminals a chance (not sure on the odds) to use gloves in the act of a crime. This solves the issue of late-game players knowing majority of the citizens fingerprints.
#Killers Use Gloves
weak mason
past shadow
Intelligence stat? 🤔
stiff oracle
Intelligence stat? 🤔
That,
Masks, misleading clues etc
Stuff that scales with difficulty
midnight burrow
You could potentially have the idea that killers could "dust", or clean up after themselves. Detectives would know they're dealing with this kind of thing with a significant lack of prints even from the apartment owner.
spark linden
You could also then track someone down if they splashed cleaning fluid all over a scene because you found they bought, like, several gallons of cleaning liquid.
And they're not a janitor.
stiff oracle
Blood traces on clothing found at the suspects apartment?
spark linden
Yeah I feel like blood identification is something sorely missing from the game in general.
Why have blood types but no means of identifying blood?
That could pair well with some people's suggestion of a kidnapping feature. The kidnapped might put up a struggle and so you identify them and possibly the culprit based on spilled blood.