Continuity mistake: When Aaron Wright lights his cigarette in the NCIS elevator, he takes it out of his mouth to blow out a puff of smoke. His arm remains down by his side, but in the next shot his cigarette is instantly up in his mouth. (00:29:10)
Continuity mistake: At the start Gibbs has his coffee in his left hand. Camera cuts and it's now in his right hand. (00:02:25)
Factual error: Obviously written to make the story interesting, but Gibbs says that the first criminal caught by DNA was a Mafia don in Sicily. Well as anyone interested in forensics knows it was Colin Pitchfork in England.
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.