In addition to conditions on the import and export of the above wastes, there are stringent requirements for notice, consent and tracking for movement of wastes across national boundaries. It is of note that the convention places a general prohibition on the exportation or importation of wastes between parties and non-parties. The exception to this rule is where the waste is subject to another treaty that does not take away from the Basel Convention. The United States is a notable non-party to the convention and has a number of such agreements for allowing the shipping of hazardous wastes to Basel Party countries.