Background 3 Little research has measured the prevalence of pesticide exposure among farmworkers. Small samples Usually cross-sectional design No research has documented a direct association between direct measures of farmworker pesticide exposure (biomarkers)and farmworker health outcomes. Difficult to get biomarkers ■ Difficult to follow farmworkers for sufficient time Background 3 † Little research has measured the prevalence of pesticide exposure among farmworkers. „ Small samples „ Usually cross-sectional design † No research has documented a direct association between direct measures of farmworker pesticide exposure (biomarkers) and farmworker health outcomes. „ Difficult to get biomarkers „ Difficult to follow farmworkers for sufficient time