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I wonder if dealers in fraudulent art/whisky/whatever have started purchasing samples of 13C or 14C to try to fool this kind of analysis. I don't know what the cost would be, but it would only need very small quantities (and very, very careful measurement.)

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That would only help if you wanted to present something old as being newer.

It's been a while since I've interpreted delta 13C measurements but it seems like adding 13C could mimic older materials, however you are correct about 14C unless you want to make something modern look like its ~1960s era. You would need to reduce 14C (either by dilution with depleted ethanol [quick search doesn't find a source for this] or somehow purify the scotch itself) to make it look pre-1950s.

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