A retired University of Tennessee professor was recently found guilty of passing secrets from a U.S. Air Force contract to research assistants from China and Iran. Plasma physics expert J. Reece Roth was convicted on 18 counts of conspiracy, fraud, and violating the Arms Export Control Act. Prosecutors in the Knoxville trial said Roth gave graduate students access to sensitive information while they researched a plasma-guidance system for unmanned aircraft. Roth faces up to 160 years in prison and more than $1.5 million in fines.