Article 6 Clause 2 of the Constitution states what is considered the supreme law of the land. There is no mention Supreme Court precedents. This clause clearly states that the Constitution is the supreme law of the land and no laws whether federal or state can violate the constitution and be legally binding.
A notice of hearing is a legal document used in U.S. courts to inform individuals that the government is pursuing a an action against them. It is different than a notice of trial, which is used when individual parties are suing each other. These documents are reserved for actions in which the government is seeking redress from individuals.
If you have a hearing and do not receive a notice of decision within 90 days of the hearing date, you may wish to followup the status of the case by making a call to the hearing office. Usually, the answer to an inquiry will simply be that the case is still pending.