Legality
Because of European Union food hygiene-health regulations, the cheese was outlawed for a time, and offenders faced heavy fines. However, it remained possible to acquire casu marzu on the black market, where it could sell for double the price of an ordinary block of pecorino cheese.
Currently, the EU ban has been circumvented by means of another EU regulation. Casu marzu has been declared a "traditional" food (it has been made in the same manner for more than 25 years, and the recipe is thousands of years old) and it is therefore exempt from ordinary food hygiene regulations. The traditional method of making the cheese is explained by an official paper of the local government.
Read more about this topic: Casu Marzu