The United States suspended collection of detailed marriage and divorce data beginning in January 1996 due to limitations in state-collected information and budgetary considerations.

By 1980, every U.S. state had vaccine-related laws concerning children before they entered school, with some states allowing county public health boards to decide which vaccines were required.

On July 1, 2024, the U.S. Supreme Court ruled 6–3 for the first time that former presidents have broad immunity from criminal prosecution for official acts.

An obscure 1845 Florida statute allowed the state legislature to choose its own presidential electors if the state had 'failed to make a choice' for president on Election Day, and Florida Republicans relied primarily on that statute in their 2000 effort to award the state's electoral votes to George W. Bush.

Abraham Lincoln is the only U.S. president to have been granted a patent.

A 1999 amendment to 50 USC 435(a)(3), enacted via Pub. L. 106-120, added a requirement covering consent to access computers used in the performance of government duties, in addition to financial and travel records.

A congressional bill in 1890 proposed requiring the Census Office to issue identification cards to every enumerated Chinese person, with anyone found without a certificate subject to being deemed unlawfully present and deported; the bill passed the House but failed in the Senate.

A United States Court of Appeals sent the Oakhurst Dairy overtime case back to a lower court due to ambiguity caused by the lack of a serial (Oxford) comma in the Maine statute.

If a federal agency determines that unusual circumstances exist, it may take up to 30 working days to respond to a FOIA request instead of the standard 20 working days.

In 1909, the Nebraska Supreme Court invoked Territory of New Mexico v. Yee Shun to determine whether Japanese witness Jack Naoi could be disqualified because 'Japan is a heathen country,' according to Arif Dirlik and Malcolm Yeung in Chinese on the American Frontier.

In May 1946, the U.S. Supreme Court ruled 5-2 in favor of the Causbys in United States v. Causby.

Charles Lang Freer's restrictions required that the U.S. collection never be altered, loaned to other exhibitions, or supplemented with outside works.

In 1855, Massachusetts became the first U.S. state to require children to receive a smallpox vaccine before attending school.

Arizona State University political scientist Steven Smith said that President Woodrow Wilson supported the first of several filibuster workarounds, which was enacted in 1917.

In SEC v. Hansen, et al., 726 F. Supp. 74 (S.D.N.Y. 1989), a bank was found to have violated Regulation U by knowingly participating in an illegal free-riding scheme.

In 1963, only 20 U.S. states mandated that children receive several vaccines before starting school.

Federal law requires voters in U.S. national elections to be U.S. citizens.

The ruling in Territory of New Mexico v. Yee Shun established the precedent that Asian Americans had the right to testify in court.

President George Washington personally signed the first U.S. patent.

Most legislation in the U.S. Senate requires a 60-vote threshold to overcome the filibuster rule.

More than 99% of species listed under the U.S. Endangered Species Act have avoided extinction due to the law's protections.

A senator placing a hold in the U.S. Senate is theoretically required to identify themselves after six days, but this rule did not apply effectively when the hold was placed at the end of a congressional session.

In 2022, a US appeals court in Washington, DC, ruled that an AI system called DABUS could not be listed as an inventor because US statutes define an inventor as an "individual," meaning a human being.

AARO's historical review found no evidence that the U.S. government possessed extraterrestrial technology.

In U.S. v. Dotterweich (1943), the Supreme Court ruled that responsible corporate officials, as well as the corporation itself, could be prosecuted for violations even if the officials did not intend or know about them.

The FBI's post-scandal guidelines remained hidden from the public for decades.

The U.S. Supreme Court's online merits briefs collection includes a brief dated as early as August 12, 1936.

ProPublica found that Hawaii property owners received more than 230 exemptions between 2000 and 2020 from state and local laws restricting seawalls, including approvals to retain existing shoreline structures or build new ones.

The FBI may treat the existence of classified records concerning foreign intelligence, counterintelligence, or international terrorism as exempt from FOIA disclosure requirements.

In 1971, Mike Gravel conducted a one-man filibuster against the Vietnam-era draft and read 4,100 pages of the 7,000-page Pentagon Papers into the Congressional Record.