and got additional units. reporter: venus dad showed trooper steensma the patch of his gravel driveway that was scuffed up. the father also pointed out a pink hair tie on the ground and something else he hadn t spotted earlier. there was a tarp cover, a piece of plastic wrapping with the barcode on it. i didn t realize what it was or anything. i just told them that s out of place. and so he put a rock on it so the wind wouldn t blow it away. and they had people, i guess they are crime scene specialists, that gather evidence. reporter: crime scene techs were able to lift what they believed was a fingerprint off the plastic wrapper. that wrapper was for a tarp sold at walmart. but officer steensma was most troubled by what he heard from venus parents. just a week prior, their daughter won custody of her two daughters. i think the hair on the back of my neck stood up, like, you know, after speaking to the mccombs. reporter: by this time, mike scott, one of western michigan s t