This causes all sorts of complications, I mean if you erm if you qualify as a doctor in Texas er and you go to Massachusetts  you have to go through another set of examinations before they allow you to practice medicine in Massachusetts because they don't accept automatically Texas qualifications, they re regard the ri they retain the right to determine their own standards of procedures in these sorts of areas  so their own criminal and civil codes as well as their own political structures so these are major matters.