[RnMomof7]

actually hair is a good source as is tissue..in this case I would guess hair......IF they really wanted to find out what was there..and that is a BIG IF

[Rheo]

Knowing what we know now...a very big IF.

I'm trying to figure out how they could find a shell casing in her room and not put any gun/ammo related stuff on the search warrant?

What would be their justification as to not if they were really trying to solve this?