Darren asked What is an "Illegal PC"?
It's a term used to refer to someone who, due to psychiatric abuse, is in a state which makes it unwise for them to receive Scientology Auditing. They have been so messed up by damaging psychiatric treatments, such as electro-convulsive treatment (ECT), brain operations or the use of damaging psychiatric drugs, that any attempt to assist them spiritually in a way that has them looking inward is liable to push them over the edge.
It is not a permanent status. There are things a person can do to demonstrate that they have recovered sufficiently that they can safely receive Scientology Auditing, at which point they can.
In the meantime, they participate in all the other services and practices of Scientology.
Illegal = in this usage of the word, it does not refer to the laws of the land, but to the rules of Scientology Churches. "Illegal" in this sense means a violation of Church rules, for example, it is against the rules to audit someone who has not sufficiently recovered from abusive psychiatric treatment, so it is called "illegal".
PC = Pre-Clear = a person who has not yet achieved the State of Clear and is undergoing or planning to undergo Scientology Auditing with the goal of achieving the state.
I hope that answers your question, Darren.