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I guess that if you are constructing a new raised bed then you are creating a barrier around a slug-free bed (since the bed didn't previously exist). Eventually I suppose that baby slugs (which live underground, for those that don't know) might migrate through the soil - but if the surface that you build the bed on is nice and compacted this migration might be slowed or prevented. Raised beds seem an effective measure anyway (which if underground migration was consistent, you would expect not to be the case), so it'd be good to learn more about factors influencing underground slug movement!
General_Strike
I've never had good results from copper tape, etc and although I love the ingenuity of the wire above, there must be stacks of eggs/tiny slugs already in the soil?
Last season we tried some Nematodes and this really worked, essentially you're just increasing the number of natural slug predators per sqm no end. This kind of stuff:
http://www.slugoff.co.uk/killing-slugs/nematodes