The Pesticide Residues Information System (PRIS) contains the results of more than 500,000 analyses for 329 distinct pesticides (and metabolites) on an estimated 110,864 samples. Fresh agricultural commodities comprise approximately 76 percent of the samples; processed foods comprise approximately 24 percent of the samples. One or more detectable pesticide residues were found on approximately 29 percent of all samples. Samples have been collected by each State food regulatory agency for a variety of reasons such as random surveillance, product or chemical specific concerns, and consumer complaints. Sampling sites include farm fields, packing sheds, distribution/marketing warehouses, and retail grocery stores. The National Food Processors Association (NFPA) data represent the monitoring activities of member companies on processed foods or on commodities that have been purchased for processing. Scientific Certification Systems data were developed by Scientific Certification Systems (SCS) laboratories under contract to private food retailers located in the U.S. and Canada. Samples of fresh agricultural commodities were obtained exclusively from distribution/marketing warehouses.