My parents are pretty good for picking up when I ask them to. And rarely do they drop-off a kid that I look at and go "Really? You thought they were ok to come to daycare??"
Having said that, I think you can tell the difference between a poop that is teething related (looser, but only because of the extra drool, etc) and actual diarreah (everything is off- color, texture, and of course FOUL odor).
I will call after the first actual diarreah. I am confident that I know when a child can stay and when they MUST go home.
And I agree. Although I understand that it is difficult to leave/miss work, I need to work with families that will make EVERY effort to come get a sick child. It is important to me, because that is a core value (ie; kids are the most important thing of all).