Let's talk about the Detective

[Frank_Stein]

Perhaps Detective should have "Detective training" that allows them to see whether someone was killed with a blunt or sharp weapon, maybe vials to let them collect blood samples, so on.

I think that's generally a good direction to go job/role training, where extra information is provided on examination when it's relevant to their line of work. 

Very in line with a social deduction game that some people should have more information than others would.