microscope to compare the similarities. they found paint on both the t-shirt and the bathrobe with the same chemical makeup. >> what i believe happened now, there is an evidence transfer from the blue t-shirt deposited on to the pink bathrobe. >> this proved that sarah had worn the robe over the top of her t-shirt. finally, investigators analyzed the gloves found in the garbage. >> when you handle an item and you leave behind the oils and residues from your skin, that contains skin cells. and we are oftentimes able to get dna from those samples. >> scientists swabbed the inside of the gloves and found dna from only one person. >> sarah was the source of the dna found on the latex glove. >> all the clothing found in the garbage can was then checked for gunshot residue, a gas created