_Even if_ an ambassador had bad intentions (such as murdering people on a plane), there isn't anything they could charge that person with unless the President revoked his credentials.
I think the only thing our government could do in that case would be to kick the offending diplomat out of the country.
Even if the TSA found a bomb, they couldn't take it from her, nor could the police arrest her.
I find it hard to believe that anyone would allow a diplomat to keep a bomb, regardless of what international law says.
Here's an article on diplomatic immunity. It doesn't seem to address the issue of this thread, but it does cite some examples of how misconduct of diplomats has been handled.
http://en.wikipedia.org/wiki/Diplomatic_immunity
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