The FDA has monitored levels of lead in foods for decades through the Total Diet Study (TDS), the Agency's ongoing market basket survey in which about 280 core foods (TDS foods) in the U.S. food supply are collected, prepared as for consumption, and analyzed to determine levels of various contaminants and nutrients in those foods. The FDA also tests for lead in foods under the Toxic Elements in Food and Foodware and Radionuclides in its Food Compliance Program. The TDS includes a wide range of foods, representative of the diet of the U.S. consumer. Although lead is still present in many foods, of the 8,801 foods collected and analyzed between 2005 and 2013, 88% had levels that were too low to be detected.