Henry says the machines offer an easy path for thieves. "Even if you use your own [thumb] print, there's no way to prosecute," he says, because the person selling the phone is not necessarily the person who stole it. Or, he says, "you pay a kid in the mall $5 to put his thumb there." In one case he learned of, Henry says, the ecoATM camera could not tell the difference between a driver's license and a photocopy. "If they were serious, they would mail a check to the address on the ID," Henry says of the company. "The fact that they're willing to give cash at the point of sale says to me they're more interested in getting the phone and not curbing the culture that we already have."