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“The new unit is extremely easy to use and reveals instantly whether someone has been handling cocaine by lighting up green spots on the hands or face. It will be used by door staff to check customers as they come into premises. Anyone found to have traces of cocaine will be refused entry and could find themselves being searched and questioned by police.”He added that the latest device would sometimes be used in conjunction with the police’s own portable, computerised drugs equipment which can detect traces of almost every illegal drug from a simple hand swab.