The TSCA in 1976 grandfathered in approximately 62,000 chemicals, despite the lack of safety data to support this policy.
--- What does "grandfather in" above mean? They didn't take them into account? They were allowed to be used?
grandfather : Exempt (someone or something) from a new law or regulation. com/definition/us/grandfather )
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grandfather: Exempt (someone or something) from a new law or regulation.
(https://en.oxforddictionaries.com/definition/us/grandfather)