they had to pay for their trash bags in granby.e dumping their trash wherever and whenever they could. >> reporter: the defense brought in its own expert to knock down the prosecutors' argument that one of the rags contained ann's dna. >> i have no idea what the source of the dna on that rag is. >> reporter: but perhaps the most damaging evidence against cara was the paint. attorney hoose went after the prosecution's paint guy on cross. his weapon of choice? sarcasm. >> you're the first guy as far as you know who has ever testified about reading wrinkles and cracks in paints, is that correct? >> that i'm aware of. >> your honor, can we please change the tone here? >> reporter: the defense attorney had to persuade jurors that cara hadn't poured the paint. he accused the paint expert of buying into the first responders' observation that the paint was wet. >> first responders -- these are people you've never met, correct? you don't know how much training they have or if they've even seen a bucket of paint before, correct? yet you're r