Response: We do not intend for lawful disclosures of protected health information for law enforcement purposes to be limited to those in which a law enforcement official knows that law has been violated. (federalregister.gov)
They also added that the agency's assumptions were not adequately supported by a relevant enforcement purpose. (investinblockchain.com)
But since they chose to define it and name it specifically, it seems that they are trying to specify what constitutes a legal chemical for law enforcement purposes. (law.stackexchange.com)