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In page Flare:

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US courts have taken action regarding the use of perchlorate in manufacturing pyrotechnic devices such as flares. For example, in 2003, a federal district court in California found that the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) applied because perchlorate is ignitable and therefore a "characteristic" hazardous waste.[3] Flares manufactured in the United States no longer use potassium perchlorate as an oxidizer and do not contain aluminium or magnesium.[citation needed]