There is no conceivable normal reason for a blouse to come out of a dirty hamper and end up wadded in a drawer. There is simply no way that Laci did that.
If she had thought that her blouse was actually not that dirty adn she wanted to wear it again tomorrow, wouldn't she have either hung it up carefully or folded it NEATLY in the drawer?
It was definitely Scott. I bet he didn't know whether it had been seen in the hamper or not (since he isn't too bright about any of this stuff already), so thought to himself "Well, I can't throw it in the TRASH; that would be suspicious. If I stuff it into the drawer, they will all think Laci put it there."
Well we know Laci didn't do that...it happened between Dec. 24 and Feb...she was "missing" (she was murdered) So who does that leave? The only people in that house were the Peterson's...(Snott's family would not allow the Rocha's access) So do you think Jackie decided to do some laundry and opted not to launder Laci's cloths...instead wad them up and put them in a drawer? NOOO, she loved Laci like a daughter, Laci called her "Mom." I doubt that Janey would have done that either... So that leaves us with Snott...who was such a neat-nick that he threw his clothes in the washer as soon as he hit the door...while he was frantic about his "missing" wife....