Horse meat here is too expensive to buy, but regularly on the shelves. One thing I noticed shortly after we arrived in France was the complete lack of pre-processed foods. You can't get frozen Lasagne, processed meat products and ready meals. Minced meat is usually minced from a cut of your choice by the butcher, same as beef burgers -made while you wait. So there is little opportunity here for the unscrupulous to slip in some dodgy meat.
So the answer is to stop buying convenience stuff and make everything from scratch. Then you can be certain of what is in it. Problem is no-one working can afford the time to do that. I's not just the cooking but gathering all the ingredients. Having said that, since we stopped watching TV completely, we have a lot more time available.