Question: Betacetylmethadol is a substance regulated by what act signed into law by President Richard Nixon? 

Context articles: Zilch memo
Nixon v. General Services Administration
United States v. Nixon
Betacetylmethadol
Bobbie Kilberg
Donald A. Nixon
Controlled Substances Act
United States vice presidential selection, 1973
Marine Mammal Protection Act
Airport and Airway Development Act of 1970

A memorandum known as the Zilch memo was an American government document sent by National Security Advisor Henry Kissinger to President Richard Nixon on January 3, 1972, about the military situation in Laos during the Vietnam War.
 On the memo, in his own handwriting, Nixon described the decade-long bombing campaign by the United States in Southeast Asia as a "failure," having achieved "zilch," despite public comments to the contrary.
 Just the day before, January 2, Nixon told CBS News reporter Dan Rather in an interview that the bombing was "very, very effective."
 Previously missing from the Richard Nixon Library, the memo was discovered in the possession of Alexander Butterfield, who served as the Deputy Assistant to President Nixon from 1969 to 1973, by "Washington Post" reporter Bob Woodward, who subsequently published it in his 2015 book "The Last of the President's Men".
Nixon v. General Services Administration, 433 U.S 425 (1977), is a landmark court case concerning the principle of presidential privilege and whether the public is allowed to view a President’s “confidential documents”.
 The Presidential Recordings and Materials Preservation Act, signed into law by President Gerald Ford in 1974, ordered that the Administrator of General Services obtain President Richard Nixon’s presidential papers and tape recordings.
 In addition, the Act further ordered that government archivists seize these materials.
 These archivists would preserve the material deemed historic and return to former President Nixon the materials deemed as private.
 Furthermore, this Act stated that material that was preserved could be used in judicial hearings and proceedings.
 Immediately after this Act was enacted, Richard Nixon filed a lawsuit in a federal district court claiming that the Act violated the principle of separation of powers, the principle of presidential privilege, Nixon’s personal privacy, his First Amendment right of association, and further asserted that it amounted to a constitutionally prohibited Bill of Attainder.
United States v. Nixon, 418 U.S. 683 (1974), was a landmark United States Supreme Court decision which resulted in a unanimous 8–0 ruling against President Richard Nixon, ordering him to deliver presidential tape recordings and other subpoenaed materials to the District Court.
 Issued on July 24, 1974, the ruling was important to the late stages of the Watergate scandal, when there was an ongoing impeachment process against Richard Nixon.
 "United States v. Nixon" is considered a crucial precedent limiting the power of any U.S. president to claim executive privilege.
Betacetylmethadol is a synthetic opioid.
 It is a diastereoisomer of alphacetylmethadol (as well as levacetylmethadol).
 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.
Bobbie Kilberg (born Barbara Greene; October 25, 1944) is a Republican operative who has worked for Presidents Richard Nixon, Gerald Ford, George H.W. Bush, and George W. Bush.
 Kilberg is currently the President and CEO of the Northern Virginia Technology Council and has been since 1998.
 She was briefly an attorney with the Washington law firm of Arnold & Porter from 1971 to 1973.
 Her White House experiences include serving on the staff of President Richard Nixon's Domestic Policy Council, serving under President Gerald Ford as Associate Counsel and serving for President George H.W. Bush as Deputy Assistant to the President for Public Liaison and as Director of the White House Office of Intergovernmental Affairs.
Donald A. Nixon (born 1946) is a businessman.
 He is the nephew of former President Richard Nixon and the son of Richard Nixon's brother, Donald Nixon and Clara Jane.
The Controlled Substances Act (CSA) is the statute establishing federal U.S. drug policy under which the manufacture, importation, possession, use and distribution of certain substances is regulated.
 It was passed by the 91st United States Congress as Title II of the Comprehensive Drug Abuse Prevention and Control Act of 1970 and signed into law by President Richard Nixon.
 The Act also served as the national implementing legislation for the Single Convention on Narcotic Drugs.
In 1973, Republican Vice President Spiro Agnew was forced to resign following a controversy over his personal taxes.
 Under the terms of the 25th Amendment, a vice presidential vacancy is filled when the president nominates a candidate who is confirmed by both houses of Congress.
 Republican President Richard Nixon thus had the task of selecting a vice president who could receive the majority support of both houses of Congress.
 Nixon considered selecting former Texas Governor John Connally, New York Governor Nelson Rockefeller, and California Governor Ronald Reagan.
 However, Nixon settled on House Minority Leader Gerald Ford of Michigan, who was popular among the members of Congress and who was good friends with Nixon.
 Ford won the approval of both houses by huge margins, and was sworn in as the 40th Vice President of the United States on December 6, 1973.
 In 1974, Ford ascended to the presidency after the Watergate scandal led to the resignation of President Nixon.
The Marine Mammal Protection Act (MMPA) was the first act of the United States Congress to call specifically for an ecosystem approach to wildlife management.
 It was signed into law on October 21, 1972 by President Richard Nixon and took effect 60 days later on December 21, 1972.
 MMPA prohibits the "taking" of marine mammals, and enacts a moratorium on the import, export, and sale of any marine mammal, along with any marine mammal part or product within the United States.
 The Act defines "take" as "the act of hunting, killing, capture, and/or harassment of any marine mammal; or, the attempt at such."
 The MMPA defines harassment as "any act of pursuit, torment or annoyance which has the potential to either: a. injure a marine mammal in the wild, or b. disturb a marine mammal by causing disruption of behavioral patterns, which includes, but is not limited to, migration, breathing, nursing, breeding, feeding, or sheltering."
 The MMPA provides for enforcement of its prohibitions, and for the issuance of regulations to implement its legislative goals.
The Airport and Airway Development Act of 1970 (Pub.L.
 91-258) was a United States federal law passed during the 91st Congress, and signed into law by President Richard Nixon in conjunction with the Airport and Airway Revenue Act on May 21, 1970.
 The act was meant to fill funding gaps in the airport and airway system, which had become inadequate due to the rapid growth of aviation.
 The legislation was estimated to generate greater than $11 billion in funds,