A razor nick opens back up due to rubbing on a pillowcase and leaves a dime sized spot of blood. The pillowcase is laundered with detergent and fabric softener and then put into the drier with the rest of the linens.
The pillowcase, being used in the regular rotation of the bed linens, goes through this cycle a few times over the period af a few months.
Could DNA be extracted after four or five washings?
(No, I do not need this answer fast. Just random curiosity)