clean bill of health
clean bill of health {n. phr.}
1. A certificate that a person or animal has no infectious disease.
The government doctor gave Jones a clean bill of health when he entered the country.
2. {informal}
A report that a person is free of guilt or fault.
The stranger was suspected in the bank robbery, but the police gave him a clean bill of health.
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Source: A Dictionary of American Idioms