Well, I wasn't primarily thinking about the internet pills. In many developing countries (particularly in south-east asia), something like 5-30% of all drugs are counterfeits without proper active ingredients (see e.g. http://www.bmj.com/content/324/7341/800.full). There are many skilled and motivated users (doctors) failing to detect the fakes because the packaging is identical.

Similarly, the rock climbers mentioned earlier in the thread probably would also be motivated to check authenticity?

I find the "a technical solution is not required" comment a bit odd. Spam is not a technical problem either, but we still use spam filters.