> The abstract[0] says $1 and $100 denominations were less likely to test positive. Most of the ATMs in NYC give me $20 notes. Sometimes for a larger withdrawa

> The abstract[0] says $1 and $100 denominations were less likely to test positive. Most of the ATMs in NYC give me $20 notes. Sometimes for a larger withdrawal (300 or more) they mix $20 and $50 notes.