The double bind is a dishonest debating technique by which one person
places another in a situation by which they can say nothing without
being wrong. It is everything about winning and nothing about finding
the truth.
The first thing they will do is ask how you were involved in
Scientology.
If you are a former Scientologist they will tell you that you never
understood the doctrine or you left because of some crime on your own
part. This is somewhat ironic because Scientologists actually know
very little about Scientology! They are rather like the blind man
trying to describe an elephant. One blind man holds the trunk ans says
that an elephant is a kind of snake. The other holds an ear and
believes it to be a large bat and so on.
Each blind man is an expert on a small area of elephant but none know
the shape of the whole animal. This is what happens if you try to
learn about Scientology by taking courses- you become an expert on
very small things but understand nothing.
If you were never a Scientologist you will be told you know nothing.
This is rather like saying you need to be a heroin addict to know that
addiction is a bad idea. It is possible to know that Scientology is
evil simply by seeing what it does to people. There is no need to join
the madness.