Basically, many laws overlap and it isn't always clear what applies. A new law may pass but they don't go strike through all the old laws that no longer apply.
Also there are laws that reference other country's laws. An example is that is (or was) illegal to buy/posses a type of meat in the US that is illegal in other jurisdictions. This was made to protect endangered animals but can easily apply to everything as there are lot of jurisdictions and who really knows if any one of them currently doesn't allow pork or beef for whatever reason.
Also there are laws that reference other country's laws. An example is that is (or was) illegal to buy/posses a type of meat in the US that is illegal in other jurisdictions. This was made to protect endangered animals but can easily apply to everything as there are lot of jurisdictions and who really knows if any one of them currently doesn't allow pork or beef for whatever reason.
More details here a few minutes in: https://www.youtube.com/watch?v=d-7o9xYp7eE