http://www.health.state.mn.us/foodsafety/clean/xcontamination.html http://www.health.state.mn.us/foodsafety/clean/xcontamination.html http://www.health.state.mn.us/foodsafety/clean/xcontamination.html http://www.healthycanadians.gc/init/cons/food-aliments/safety-salubrite/reusable-bags-sacs-reutillsable-eng.php http://www.cdph.ca.gov/pubsforms/Documents/fspnu04ReusableBags.pdf http://www.cdph.ca.gov/pubsforms/Documents/fspnu04ReusableBags.pdf http://www.surfrider.org/programs/plastic-pollution http://www.surfrider.org/programs/plastic-pollution http://www.foodprotection.org