Where does this definition of controlled substance come from?
This entry for controlled substance is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is controlled substance a noun, verb, or something else?
In this entry, controlled substance is tagged as noun.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.