Pistachios have been affected by dozens of recalls in Canada due to a salmonella outbreak. According to food safety experts, the recalls may be linked to imports from countries with weaker food safety standards. She pointed to inconsistent food safety standards and a lack of clear labelling on product origins. While the U.S. has strict food safety programs, the Middle East are still working at their food safety programs. How Pistachios Are ContaminatedProulx explained that pistachios are often eaten by birds, and their droppings can contaminate the nuts.