I know a real case of horse meat sold as beef in UK and they have lots of regulations (including the EU on top of local). You can put all the rules and laws in the book, but don't just relax and hope all will be obeyed. As some SCOTUS decision stated a while ago, some laws and regulations are made so dense and confusing it is almost impossible to comply to the letter - they were talking about something as simple as driving a car on a public road.