Conversely, I hve heard that copper wire/strips deterrs slugs because of electric shock, but not snails. I have tape around my veg beds, and no sign of either breaking in yet (fingers crossed). The only thing I have found that definitely prevents snail damage is to grow whatever it is that you don't want munched in a pot, and put vaseline around the edge of the pot. Because it is too slimy, they can't get across. But you have to make sure that you don't have foliage overhanging the vaselined edge, as this cn give the little b****rs a bridge.
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