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German Court Orders Deletion of Footage Exposing Pig Gas Chambers
(veganhorizon.substack.com)
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Most likely. And actually humane gases would be rarer and more dangerous to ... well, humans working there.
CO^2 is The gas that causes panic since that's what the body uses to regulate it's oxygen/carbon cycle. It's a built in alarm. Plus you can just vent it to atmosphere. And it's cheap.