First, for the thirteen gardeners on the planet who have not heard that you can attract slugs with beer, a bit of an explanation. A slug beer trap is a snap to prepare. You just insert a small dish or bowl into the ground and pour some beer in. Any beer will do, even non-alcoholic beer. Slugs, attracted by the smell of malt, are supposed to fall into the dish and drown. Moreover, if you try it, you will indeed find a few drowned slugs marinating in the beer the next morning. So, in principle, it seems to work.