22 U.S.C. § 6742

1. (a)Notwithstanding any other provision of this chapter, no person located in the United States shall be required to report on, or to submit to, any routine inspection conducted for the purpose of verifying the production, possession, consumption, exportation, importation, or proposed production, possession, consumption, exportation, or importation of any substance that contains less than—
   1. (1)10 percent concentration of a Schedule 2 chemical; or
   2. (2)80 percent concentration of a Schedule 3 chemical.
2. (b)The percent concentration of a chemical in a substance shall be measured on the basis of volume or total weight, which measurement yields the lesser percent.