[astroglide]

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Any experienced mob hit man will tell you that its not wise to wash up after murder someone in the crime scenes bathroom. This is where forensic scientists get crucial evidence such as hair, blood, etc.

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his hair, blood, fingerprints, and etc are all over the house including the study where bloody murders occured. there's nothing he could do to prevent them from locating data everywhere, it's just a matter of whether he's been booked before or not.