Fakes and Forgeries

How can the trade and collectors protect themselves from the increasing practice of fakers  finding old pieces of silver with no marks and than striking new hallmarks. The fakers also seek out pieces which look provincial from places like Ireland, Scotland and Channel Islands and than strike with makers mark only making it even more difficult to detect as there are no hallmarks struck.  These pieces can than be sold overseas, in such markets as the USA where no plate law exist and can end up in collections and museums before coming back on the European market 30 years later.