Going, going, gone: currency notes issued in 2016 now ‘unusable’

New currency notes with higher ‘security’ features that were introduced after demonetisation are quickly becoming 'unusable' within just two years of circulation ,say reports. According to sources, that’s because of the poor quality of paper used for printing these notes versus the earlier notes which used to be in circulation for years. “Unusable” currency can't be used in ATMs as the sensors inside the ATMs can't detect the bad quality notes.