We dig them in moderation up on the Islands frequently. At this point I'm just sort of closing my eyes, plugging my ears, and saying, "lalalalala" when I start to wonder about heavy metal contamination. They sure are yummy, though, and the shells can be crushed and used as a garden amendment.
Before you go harvest your own, though, make sure to call your
local Red Tide hotline. It only takes a minute to find out if it is safe to harvest or not.
Washington State's Marine Biotoxin Hotline: 1-800-562-5632