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precursor

Defined in 3 places across 2 titles of the United States Code.

The term “precursor” means any chemical reactant which takes part at any stage in the production by whatever method of a toxic chemical. The term includes any key component of a binary or multicomponent chemical system.

Same definition in 2 sections

In general.—The term "precursor" means any chemical reactant which takes part at any stage in the production by whatever method of a toxic chemical. The term includes any key component of a binary or multicomponent chemical system.

Source

“precursor” has the meaning given the term in section 229F(6)(A) of this title;

Source