It is, I think, well known that many (if not all) banknotes are contaminated to some degree with cocaine. Now in “More or Less”, a BBC Radio programme on statistics etc (honestly, it is interesting and fun) reports on this, and how the new “plastic” polymer notes will not reveal contamination (at least without new technology). Also, why do most notes show contamination, when obviously only a tiny proportion were involved in the snorting etc of the drug?
www.bbc.co.uk/programmes/p05tpn4b#play
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