IOW they can’t just dig up bodies only to leave them laying around forgotten in the some museum storage unit for a couple dozen years until some intern stumbles back upon them. Two years plus an extention is plenty of time to do whatever they need done. Be respectful of the body and bury it back where the person wanted to be however many years ago.
IOW, a bureaucrat has imposed a one size fits all rule without any idea of either the current techniques and procedures available, and of course no idea what kinds of tests will be available in the future, all the while ignoring the facts of life regarding the tenuous funding and hoop-jumping needed to get it (except in the case of global warming).