Question: Betacetylmethadol is a substance regulated by what act signed into law by President Richard Nixon? 
Sentence (from "Betacetylmethadol"): In the United States, betacetylmethadol is a Schedule I drug Narcotic under the Controlled Substances Act, with an ACSCN of 9607 and a 2 gramme manufacturing quota as of 2014.
Relevant evidence: Yes