A cook at a carnicería handles raw pork, then answers his cell phone, and returns to portion cooked carnitas. How many handwashing opportunities did he miss if he washed at none of these points?

解析

He should have washed hands after handling raw pork (before touching anything else), and again after touching his cell phone, which is a contaminated non-food surface, before portioning the ready-to-eat carnitas. That is at least two missed handwashing points. A pocketed phone is handled constantly and is not clean, gloves worn during an earlier step do nothing for the contacts that follow them, and the carnitas do not have to be touched by the phone directly — the hands carry it.