http://www.cnn.com/2017/06/26/health/atm-dirty-cash-partner/ I know, belongs in the currency forum probably.
Such research is well known and will probably be one basis of elimination of paper money and coinage, and lead to personal plastic only in the near future.
Implants, bar-code tattoos, retina recognition,etc... they are coming IMO. Paper money will no doubt be eliminated. The only question is when???