wallace. what went wrong? how'd that happen? >> in the process of transposing numbers from actual measurements at the scene to the crime scene program, numbers were just transposed wrong. >> reporter: wallace admits the error but says it was minor, that conrad truman did not deserve a new trial. >> it's not that significant as they made it out to be. >> reporter: did those incorrectly entered measurements change your opinion of conrad truman's guilt? should they change anyone's opinion? >> they didn't change my opinion. >> reporter: nor did it change the opinion of the deputy district attorney, tim taylor, who decided to take on the task himself of prosecuting conrad once again. >> i think craig had been into the case for a long time, so i wanted fresh eyes. so i went through all the evidence. and even with the medical examiner changing his opinion, i still felt that there was enough to go forward. but we knew going into it, it was going to be tough. >> reporter: at trial the