Leafy Produce (IMAGE) Penn State Caption The researchers assessed food safety behaviors at Pennsylvania farmers markets using direct concealed observations and state sanitarian observations, and checked select samples of leafy green produce and meat obtained from vendors for the presence of hygiene indicators such as fecal coliforms, Listeria, andE. coli. Credit Joshua Scheinberg Usage Restrictions Non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.