Yet another level to the story:

"Liberia to prosecute man who brought Ebola to US"

http://news.yahoo.com/dallas-er-sent-ebola-infected-patient-home-050718374.html

Apparently, the Liberian government is alleging that he lied on his exit questionnaire about his contacts with infected persons. The associated press claims they have a copy of the questionnaire he signed, which seems to confirm what the Liberian government is saying.
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"Better is the enemy of good enough."