clean bill of health

a certificate of health attesting the lack of a contagious disease, as on a ship.
an assurance, as by a doctor, that one is in good health.
Also, clean bill. an assurance, especially an official verdict by a committee, that a group or an individual has proved, under investigation, to be morally sound, fit for office, etc.

1850–55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Cultural Dictionary

clean bill of health definition

To “get a clean bill of health” is to be told by some authoritative source, generally a doctor, that one is perfectly healthy. The phrase is sometimes used figuratively to indicate that a person or organization has been found free of any sort of irregularity: “After looking into her financial background, the Senate gave the nominee a clean bill of health.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage
Idioms & Phrases

clean bill of health

A report confirming the absence of fault or guilt in a person or thing, as in Jeff checked every component and gave the computer a clean bill of health, or He had a foolproof alibi so the police had to give him a clean bill of health. This term comes from a 17th-century practice of requiring ships to produce a medical document (bill) attesting to the absence of infectious disease on board before landing.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Foreign observers are expected to give the vote a clean bill of health.
More padding-in the form of cash in the bank-will be necessary to secure a
  clean bill of health.
There could be a big shift if one of these were to be given a clean bill of
The launch itself, as always, also depends on the weather and on a clean bill
  of health for the shuttle.
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