How U.S. Execution Methods Work—From Injection to Squad
The United States uses five legally authorized execution methods. Here's how each works, why lethal injection became dominant, and why states are now reverting to older alternatives.
Five Methods, One Eighth Amendment
The United States currently authorizes five methods of execution: lethal injection, electrocution, lethal gas, hanging, and firing squad. The Supreme Court has never declared any method unconstitutional under the Eighth Amendment's ban on cruel and unusual punishment, though individual state courts have occasionally struck down specific protocols.
Which method a condemned person faces depends on where the crime was prosecuted and what the relevant jurisdiction permits. At the federal level, the Bureau of Prisons carries out sentences at the U.S. Penitentiary in Terre Haute, Indiana, under protocols set by the Department of Justice.
Lethal Injection — The Modern Default
Oklahoma became the first state to adopt lethal injection in 1977, and Texas carried out the first execution by this method in 1982. By the early 2000s, lethal injection had become the overwhelmingly dominant method across all death-penalty states.
The original three-drug protocol used sodium thiopental (an anesthetic), pancuronium bromide (a paralytic), and potassium chloride (to stop the heart). When pharmaceutical companies — particularly European manufacturers — began refusing to sell these drugs for use in executions, states scrambled for alternatives.
Many turned to compounding pharmacies — small, less-regulated facilities that mix custom drug preparations. Others switched to single-drug protocols using pentobarbital, a powerful barbiturate. Indiana, for example, spent $900,000 to obtain pentobarbital for just two executions before exhausting its supply entirely.
The Drug Shortage That Changed Everything
The European Union banned the export of drugs used in executions in 2011. Major pharmaceutical companies such as Pfizer followed with their own restrictions. This created a cascading supply crisis that has reshaped how American states approach capital punishment.
States responded in different ways. Some imposed secrecy laws to shield their drug suppliers from public pressure. Others looked backward — reauthorizing methods their legislatures had abandoned decades earlier.
South Carolina reinstated the firing squad after years of being unable to carry out any executions due to drug shortages, and conducted two firing-squad executions in 2025 — the first in the United States in over a decade. Alabama pioneered the use of nitrogen hypoxia, executing a prisoner with nitrogen gas in 2024.
How Each Method Works
Electrocution
The electric chair, introduced in 1890, sends between 500 and 2,000 volts through the body via electrodes attached to the head and leg. It remains a backup option in several states, though it has not been a primary method since the 1990s.
Firing Squad
The condemned is restrained in a chair with a target placed over the heart. Typically five shooters fire simultaneously from roughly 25 feet away, with one rifle loaded with a blank so no individual shooter knows who fired the fatal round. Death is generally considered rapid.
Lethal Gas
The prisoner is sealed in an airtight chamber and exposed to hydrogen cyanide or nitrogen gas. Cyanide gas, used since the 1920s, has largely fallen out of favor. Nitrogen hypoxia is the newest variant, causing death through oxygen deprivation.
Hanging
Once the standard method in America, judicial hanging is still technically authorized in New Hampshire and Washington state, though neither has used it in modern times.
The Legal Landscape
As of 2026, 27 states retain the death penalty on their books, though only 21 have the active authority to carry out executions — the rest operate under gubernatorial or judicial moratoriums. Since the Supreme Court reinstated capital punishment in Gregg v. Georgia (1976), more than 1,600 executions have been carried out nationwide.
The federal government maintains its own capital punishment system, separate from the states. Between 1988 and 2021, the federal government executed 16 people — 13 of them during a concentrated seven-month period in 2020–2021. President Biden commuted 37 of 40 federal death sentences in December 2024, leaving just three people on federal death row.
Why It Keeps Changing
The evolution of execution methods in America reflects an ongoing tension: the legal system demands that the state kill efficiently and without unnecessary suffering, while the pharmaceutical and medical industries increasingly refuse to participate. Each time a supply chain breaks, states reach for older technologies or invent new ones — a cycle that shows no sign of stopping as long as capital punishment remains legal.
