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Copper cyanide and bio-terrorism

There was a news report that a NJ post office had found a letter which was leaking copper cyanide. What exactly is this, and what threat, as related to bio-terrorism, if any, is there?

Thanks,

Aylalei Mackey
- Ashland, Kentucky, USA

Copper cyanide is a poison, but you'd have to eat it. The stuff found was mostly laundry detergent. This was more likely a prank than a terrorist thing.

James Totter, CEF
- Tallahassee, Florida

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