sleepysleuth
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Wouldn't they only need one? Why cut out all of them? Better to leave most in place, possibly for later examination and analysis of the site.
I would think they would take them all because if they left some behind they could be contaminated, rendering them useless. Also, in the case of defense, they would want to test them all so that they could prove/disprove if anyone else was present at the crime scene. Multiple spots of blood or multiple hairs aren't necessarily from the same person.