Yet, the question must be asked: can the application of customary law be compatible with the civil rights granted by the Constitution and the human rights guaranteed by the Bill of Rights ? This question becomes complicated, however, when one takes into account the inherent conflict in legislation between the Constitution and the Bill of Rights. Essentially, there are contradicting clauses regarding the right to culture within the same legislation. This conflict, as explained below, makes it difficult to ascertain the circumstances in which one has the right to engage in cultural practice. Due to this uncertainty, the practice of customary law is also potentially called into question.
Some people have been trying change these units in favour of the metric system since the 1820s . Much infrastructure was built in past centuries using the old measures by both British and Americans. During the 20th century some segments such as science, medicine and the military of the United States converted to the metric system but the old units are still used for daily purposes by Americans. On the other hand, world trade is conducted using the metric system and except for the ., the world uses the metric system for all purposes.