secretly, of course. and it was a plan which after a little brainstorming offered a bonus, a built-in opportunity. here's how. the a-team wanted to know if heather or ethan forged kate's $4500 check, but they needed original handwriting samples. >> we determined what was on the check that we needed comparison samples to. and we had numbers, obviously, on the check. >> then the a-team helped ethan's landlord prepare ious that contained the numbers and letters. when ethan and heather signed the document, they provided the sample that could prove they forged kate's check. the team took the handwriting to mickey dawson, who set up the police handwriting lab. the question was simple -- did heather and/or ethan forge that check from kate, the one ethan tried to cash? >> immediately that day our handwriting document examiner