Destination Unknown: why couldn't Aristides be indicted?

I've just reread parts of "Destination Unknown" (a.k.a. "So many steps to death") and I seem to have hit a paradox: Hillary/Olive meets Aristides in Morocco, as Jessop later finds out. When she is in the brain center Aristides has her brought to him and tells her all about his project. However, at the end Jessop and Leblanc agree that they will not be able to accuse Aristides. At this point, they may not know about Aristides' and Hillary's conversations, but AC and the readers know - so why doesn't she refer to them? Perhaps hearsay is not admissable, but at least the knowledge is there. Any ideas as to what I missed?
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