I am professor in an internationally oriented university, meaning it was created to have students from half a dozen different countries. It doesn't offer any law-related degree, but some degrees do require teaching legal subjects.
In those classes, I am supposed to teach [some specific kind of] law [in each one] to future professionals who will work in all these different countries. One builds a bridge (or operates an eye surgery etc.) the same way regardless of the country one's in, but law is different everywhere. How would you cope with this, i.e., how would you simultaneous teach law (or any other essentially conventional, thus localized knowledge) to many diverse (differently-originated) international students?
BTW, it is not possible to hire one law professor per country covered by the university's scope (and it would effectively distort the faculty into a law-focused one).