Neither event should have occurred on the Dreamliner, Deborah Hersman, chairwoman of the NTSB, said last week.

CNN: STORY HIGHLIGHTS

"Our goal is to get to zero deaths because each alcohol-impaired death is preventable, " NTSB Chairman Deborah Hersman said.

WSJ: U.S. Board Urges 0.05 Drunk-Driving Threshold

Despite sharp questioning from NTSB Chair, Deborah Hersman, both the FAA and Boeing witnesses failed to give satisfactory answers.

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