In September, Moms Across America (MAA) submitted food samples from 10 popular American food chains to the Health Research Institute, an Iowa-based nonprofit laboratory that tests food for nutritional value, biofunctionality, and contaminants and toxins, requesting that the laboratory test the samples for over 100 common veterinary drugs and hormones. MAA is a nonprofit activism group formed by mothers intending to bring awareness to food that contains genetically modified organisms (GMOs) and pesticides.

Molecular and chief scientist at the Health Research Institute, John Fagan, confirmed that his lab tested the food samples.

8 in 10 Popular Fast Food Chains Tested Positive

Most of the food was sampled from America's top 10 most popular food chains. Volunteers for MAA went to their local McDonald's, Starbucks, Subway, Chick-fil-A, Burger King, Taco Bell, Chipotle, Dunkin', Wendy's, or Domino's stores and ordered the same meal several times.

Kept in its packaging, each meal was sealed, frozen, and mailed to the Health Research Institute.

At the laboratory, the food and its packaging were ground up and then tested for veterinary drugs and hormones.

With the exception of Chipotle and Subway, all the food samples tested positive for veterinary drugs.