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by jpp 4197 days ago
It's been confirmed a number of places (see http://dinersjournal.blogs.nytimes.com/2008/08/11/harold-mcg... for another).

Make sure you're using Ziploc specifically -- as in that brand. Other manufacturers may have their own formulations for their plastics, including non-heat-stable plasticizers. I contacted Trader Joes, for example, when writing Cooking for Geeks, and they disclosed that their plastics are NOT heat safe.