If they're edible, you need to process them properly. This involves fasting them on cornmeal for a few days to clean any questionables out of their digestion. That is, you put them in a cage on a bed of cornmeal, and wait until only their slime trail only contains cornmeal (and not other things). One big danger, especially in urban areas, are snail baits. Your neighbors may have put out poison to kill these pests, and you don't want to eat that stuff.
Here's a good article (http://www.sfgate.com/cgi-bin/article.cgi?f=/g/a/2003/05/05/urbananimal.DTL) on eating one's snails in California.
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zvi
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Date: 2008-06-11 04:39 pm (UTC)Here's a good article (http://www.sfgate.com/cgi-bin/article.cgi?f=/g/a/2003/05/05/urbananimal.DTL) on eating one's snails in California.