"Hamilton Morris: In order to expedite the unjust punishment of people who use drugs unfamiliar to judges and prosecutors, a system was devised to convert certain substances into chemically and pharmacologically unrelated cannabis equivalents. 1 g of DMT is sentenced as being equivalent to 100 g of marihuana. 1 g of DOM is equivalent to 1.67 kg of marihuana. And 1 g of PCP is equivalent to 10 kg of marihuana."
January 1, 1970
https://en.wikiquote.org/wiki/Hamilton's_Pharmacopeia