Such food producers as Dole Food Company are using radio frequency identification (RFID) tags to monitor foods as they move from fields to trucks and then thorough processing and out. For instance, Doles pre-bagged spinach was part of the September E. coli problem that killed three people and made more than 200 ill, so Dole is using RFID to trace its contaminated produce to a specific farm and to a specific portion of a field, says Eric Schwartz, president of Dole fresh vegetables. Western Growers is a consortium of fresh produce growers, packers, and shippers and is helping develop a global positioning system (GPS) that will allow growers to monitor the progress of goods throughout the supply chain. Many large produce purchasers are also clarifying in detail how growers must monitor their farms for possible sources of contamination, including wild hogs and deer, flooding, and polluted irrigation water. For 22 major outbreaks of illness caused by leafy green contamination, regulators had no way to pinpoint the offending farm. However, with better records, identification of sources of contamination might be improved, but will not address the cause of contamination, says a spokeswoman for the Center For Science in the Public Interest. The group has asked Food and Drug Administration (FDA) and the state of California for regulations mandating food safety standards, including setting limits on use of manure by growers and requiring hand-washing facilities for workers handling produce.