For example, shellfish can pick up bacteria and other contaminants from the water they live in. Other possible sources of contamination include unclean and unsanitary equipment, insects or rodents, and humans. They do so, not only because it's required by law, but also to protect their investment. A member of the food industry who develops a reputation for unsafe food would quickly go out of business. Federal, state, and local agencies closely monitor all aspects of food production, processing, and retailing to make sure that food safety laws are followed.
Some states have a fish inspection program.
Most cases of food poisoning result from improper storage or preparation of food, either in a restaurant or at home. To avoid food poisoning, you must purchase, store, and prepare foods properly. Your responsibility for food safety begins in the grocery store. The foods offered for sale have been produced, processed, and packaged under stringent conditions and are usually safe. However, handling and storage can sometimes damage food.