any good crime solvers out there?

I'm making a fun mystery video game for free download. I am in the writing stage and I need some good suggestions for clues to use in the game. (Encyclopedia Brown-esque)

Basically it's a bunch of still photos which you navigate through suspects' houses and the crime scene a la MYST. The suspects will answer your questions and give their side of the story. You must be able to find visual clues in the suspects' houses or in the crime scene that will contradict the suspects' story or places them at the scene of the crime.

Here are a few I've come up with for an example:

-Suspect claims he lives alone and no one has been in his house for months. But he's bald and you see a hairbrush on his bathroom counter.

-You see Suspect has a spot of white paint on their pants which leads you to believe he was the one who painted over the blood.

-Suspect claims that he is a devout Mormon, but he is drinking a can of soda which is strictly forbidden in the Mormon faith.

Any ideas??? I also need some clues that prove a few suspects WEREN'T involved (when they have been set up by the real culprit to look like they were).

Thanks! :)
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