After leaving college, my first job in my field was testing something that all kinds of people, including children, consume...then, I operated by your rule. With not a whole lot in the way of support, mind you. But, how would I feel if some kid died because I didn't feel like doing my job?
Make no mistake, people...everyday, someone dies that way.
But, there's a tendency to promulgate arbitrary rules, as if that somehow made up for people lacking basic professionalism or integrity. I'll bend those type of rules all the time, if I know by experience that I'm on solid ground.