I had to do this in fact
on several children
about 20 years ago,
I was babysitting,
while being a stay at home mother
to my own 3 as well .

The mother of one of the children
had brought over a snack for the kids..
after I passed the snacks out,
I opened one for myself,
and noticed a greenish color
on parts of it!!

I dragged in all those kids
and had them all put finger in throat
to vomit it up..
which they all did,
and I threw out the other snacks,
keeping one to show the mother.
(privately )

I told the other mothers
what I had done,
and they were all in agreement,
that it is what they would have done as well.
and they appreciated it,
since it saved them worry and
perhaps a sick child,
which could have possibly have affected
their working needs as well.

I agree with Blueduck
There is a time to do this,
and is right.

But if a person regularly does this
after binge / or even normal eating,
then that could be a severe eating disorder.

Ami Joi Benton