I've given you several and could give loads more but
How about Iran Contra
I'm sure when it was first suggested the CIA was involved in narcotics traffic it was dismissed as CT nonsense
As for nessie, the evidence says it's bullshit. You wouldn't be lumping all CT's together, picking a very silly one and then saying haha look what nonsense these people believe by any chance. Thought so.
Perhaps you can listen very carefully and see if Bush and Cheney are asked about and able to explain the unprecedented intelligence failures prior to 9/11 at the whitewash of an investigation today. You or others may be able to show why my claim that THEY KNEW is false based on this evidence:
link