BLOOMINGTON â An Illinois man accused Mars Inc. of placing a needle in his M&Mâs, causing a mouth injury. The FBI called in Mark Cheviron, a polygraph examiner from Decatur, to administer a lie detector test to find the truth. âIt went all the way to federal court. I testified about that where he finally made admissions that he did it himself,â said Cheviron, a former security director at Archer Daniels Midland who also worked with the Macon County Sheriffâs Department. Cheviron is retired, but still holds a license and issues some tests. He's one of the few.