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Carbon Monoxide Execution Method

The use of carbon monoxide as an execution method throughout history, including its use in ancient times, in Nazi Germany, and in the United States, and the controversy and challenges surrounding its use.

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Jan 6, 2026

Have any jurisdictions historically used carbon monoxide for executions and what were the outcomes?

Carbon monoxide has been used historically as an execution and mass-killing agent in multiple jurisdictions — from ancient reports of Greek and Roman practice to 20th‑century gas chambers and mobile "...