An engineer, a scientist and a retired FBI chemist-turned-professor are hoping to find where the 19-year-old's body is buried and are using volatile organic compounds found in soil to help them search.
-This week's 20/20, Never Made it Home, features Kristin Smart, a college student who went missing in 1996 and is suspected to have been killed by Paul
Dr. William M. LeoGrande is Associate Vice-Provost for Academic Affairs and Professor of Government in the School of Public Affairs at American University in…