The European Commission's Joint Research Centre (JRC) publishes a monthly Food Fraud Summary summarising food fraud incidents and investigations from around the world. The September 2020 Summary has just been published. In particular, a large scale horse and donkey meat fraud has been investigated in Colombia, where horses and donkeys, often sick animals, were slaughtered and adulterated with chemicals, and sold as beef for school meals. The fraud took place between May 2018 and September 2019, and involved 2-2.5 tonnes of meat each week.
Read the monthly summary here