There are no laws that ban this or any other technique.
However, if we are going to build on what the student already knows, then the whole class has to know X before we can build on X to teach them Y.
If you had a class of 30 WASP students in Chillicothe, MO, you might be able to assume that they all knew the same sort of things.
But today, this would not apply to even 30 WASP students in some small US town: some kids would have cable, otthers a dish, others just an antenna. Some could watch the History Channel, others would spend their time watching some bimbo stroke a CZ pendent on the Home Shopping Channel.
In cities, where most Americans live today, the students will be about 1/3 immigrants and the class will not even have a common language, let alone a common educational heritage. If we knew that every student had watched 'Sesame Street', then we could base the curriculum on that. But we can't, because not every kid even knows who Kermit and Elmo are.
Teachers are given textbooks, and are ordered to teach the textbook in the order the chapters of the book are written, according to a common syllabus. No method of teaching is banned, but the orders given teachers are pretty restrictive. I doubt that any of them even know what Constructivist means. Generally, they will have heard of John Dewey in some Ed class in college,and they will have been tested over it with a multiple choice exam.