. >> reporter: mark moffat and ann taliaferro were those attorneys.the first things they did was visit the scene of the crime. >> we went to the house, and we walked in and we think, a-ha. >> within moments of being in that home, we knew immediately that there was a huge problem. >> reporter: not a problem for them. more for the people who had put conrad truman away. >>> coming up -- is an innocent man in jail for someone's mistake in math? >> i remember thinking, well, that's strange. that couldn't be right. >> we immediately started measuring. we knew right away there was a big problem. >> when "dateline" continues. oo. like those from buddy. because nothing should come between two best friends. feel the clarity, and live claritin clear. ♪ walk to end alzheimer's alzheis everywhere.tion on every sidewalk, track, and trail across this country. all of us are raising funds for one goal: a world without alzheimer's and all other dementia. because this disease isn't waiting, neither are you. take the first step on your walk right now. go to alz dot org s