Procentul de bani contaminaţi cu substanţe stupefiante este şi mai mare în oraşe mari din SUA, precum Baltimore, Boston sau Detroit. În capitala Washington DC, s-a ajuns chiar ca 95 % dintre bancnote să prezinte urme minuscule de droguri foarte periculoase. De cealaltă parte, cel mai curat oraş este, din acest punct de vedere, Salt Lake City, renumit şi pentru găzduirea grupului religios al mormonilor.
Oamenii de ştiinţă au testat bancnotele din peste 30 de oraşe americane, din Canada, Brazilia, China şi Japonia. În timp ce în SUA rezultatele au fost îngrijorătoare, China şi Japonia au prezentat cea mai mică rată de prezenţă a drogurilor pe hârtii, adică 20 % în China şi doar 12 % în Japonia.
Contaminarea cu droguri a bancnotelor în SUA a crescut cu 20 % de la ultimul studiu similar, desfăşurat de aceeaşi echipă de cercetători, acum 2 ani. „Spre surprinderea mea, găsim tot mai multă cocaină pe bancnote. Nu ştiu cu siguranţă care este cauza acestei aparente creşteri a prezenţei drogurilor pe bani dar poate fi legată de criza economică care conduce oamenii pe căi greşite, inclusiv cea a drogurilor”, a declarat doctorul Yuegang Zuo de la Universitatea din Massachussets, cel care a condus această cercetare.
Datele acestui studiu sunt importante pentru că vor autorităţile să identifice mai bine anumite obiceiuri de utilizare a drogurilor.
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