; or (2) any other method that is based on the best available science. (e) Prohibition of sales of nonessential perfluoroalkyl or polyfluoroalkyl substances (1) In general Beginning on the date that is 10 years after the date of enactment of this Act, a manufacturer or user shall not engage in the sale of perfluoroalkyl or polyfluoroalkyl substances that remain in the possession of the manufacturer or user on that date for nonessential uses. (2) Perfluoroalkyl or polyfluoroalkyl substance stocks The Administrator may approve verifiable transfers of perfluoroalkyl or polyfluoroalkyl substance stocks in the possession of a manufacturer or user to an accredited research consortium, including Centers of Excellence, National Laboratories of the Department of Energy, institutions of higher education (as defined in section 101(a) of the Higher Education Act of 1965 ( 20 U.S.C. 1001(a) )), and other relevant entities that contribute to the achievement of the policy described in section 103(a). (3) Savings provision Nothing in this subsection— (A) affects an obligation of a manufacturer or user to comply with a regulation or requirement associated with the removal, disposal, or destruction of a perfluoroalkyl or polyfluoroalkyl substance; or (B) prohibits a manufacturer or user from using a method of removal, disposal, or destruction of a perfluoroalkyl or polyfluoroalkyl substance in accordance with applicable law. 103. United States perfluoroalkyl or polyfluoroalkyl substance policy (a) General policy It is the policy of the United States that, to the maximum extent practicable and as permitted under applicable law— (1) contamination of any environmental media by a perfluoroalkyl or polyfluoroalkyl substance should be remediated to levels that do not present an unreasonable risk to public health and the environment