[nosianu]

That would be evidence they won't be able to use in court? It would be giving up on their sources at the least, even if they are not disclosed directly. I have my doubts in them being able to find out exactly which pilot gave the Chinese some specific piece of information. They would need a source that is part of the direct training, which I find a bit optimistic.

[ectopod]

We have secret trials in the UK where the accused doesn't get to hear the evidence.

So classified evidence can be used and there is no danger of it leaking.

Of course, there is a danger of innocent people being convicted but that doesn't seem to bother MPs or the government or even the public.