On April 6, Environment Canada posted a notice announcing it would restrict imports or manufacturing of oil that was produced using at least one of three potentially poisonous chemicals. Companies must notify Environment Canada at least 120 days before planned use; the companies must report any environmental release and the manufacturing process. In addition, any waste that came in contact with the chemicals must be properly disposed of or destroyed. Environment Canada and Health Canada recently conducted tests on the three chemicals and found they meet toxicity criteria in the Canadian Environmental Protection Act.