Not the OP, but first is the ambiguity introduced by "discovered" in regard to a man-made thing. One must ask if the writer intended "invented". In which case,

Not the OP, but first is the ambiguity introduced by "discovered" in regard to a man-made thing. One must ask if the writer intended "invented". In which case, how does one invent a drug that is already regulated or outlawed? Or did the writer mean that the chemist invented a street drug which was then outlawed? Or does it mean a known drug was outlawed and found for the first time by authorities within the country that outlawed it? That makes sense, but sounds like "Dog Bites Man". Did not anticipate a detailed article on chemical sleuthing.