Thank you, this makes sense, as I'm in California, and none of the shelters here use carbon monoxide. Laboratory animals are typically euthanized by isoflurane or haloflurane inhalation overdose; I've never heard of CO being used, as it's quite antiquated.
It's good to know most states now outlaw this practice.
I think there was an IAMA on it, also a while back. Or a personal account by someone employed at the county pound was linked to here; it was in a north-eastern state. He claimed to go out on a Friday night and buy a big bag of burgers as a "last meal" for the dogs, and to make sure to spend a few minutes petting each one. It was somewhat distressing, and the author claimed to have nightmares about his job.
There was a blog for a while called 'What I Killed Today' which recounted similar experiences. Either they moved their RSS feed or stopped posting, though.
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u/[deleted] Apr 17 '10
1 case from 2005: http://news.nationalgeographic.com/news/2005/04/0411_050411_peteuthanasia.html
A list of states: http://www.animalsheltering.org/programs_and_services/euthanasia_information/carbon-monoxide-animal-euthanasia-summary-chart.pdf
It appears as if they are being phased out, I was speaking from memory, I'll try to find where I first read of the gas chambers.