Continuous distillation ? Heads and Tails

[Dadismad99]

Sorry if my questions come from an odd point of view but...

In a continuous run column still, how do they remove the foreshots, heads and Tails?
I understand the chemistry and the theory of the distillation process.
I have seen, helped, witnessed both the good and the bad methods.
As a guy who really needs to sort fact from fiction, I have also visited quite a few commercial operations.
Most lower level brands use continuous fractional towers.
Beer is introduced into the column, quite high up.
Tails drop out the bottom and into the bottom tank and just overflow.
I can understand that part and the theory of how it works.
But what happens to all the nasty stuff, the methanol, acetone and such.

When grilled, most tour guides just beat around the bush, or changed the subject.
A few clever guys invoked the old trade secret talk.
Can someone here help with this question?
I can't get it out of my head