Pre-harvest aflatoxin contamination of peanuts is associated with severe late-season drought stress. Contamination can also occur after peanuts are dug if they are not quickly harvested, dried and maintained at safe moisture level; or during storage when improper conditions of moisture and temperature exist (Cole et al., 1995). Lots of peanuts with excessive levels of contamination cannot be used for human consumption and therefore represent great economic losses for the peanut industry (Lamb and Sternitzke, 2001).