Mansfield rule

noun, often capitalized R
Mans·field rule | \ˈmanz-ˌfēld-\

Legal Definition of Mansfield rule 

: a rule that a juror's affidavit or testimony as to juror misconduct during deliberations may not be used to impeach the verdict

History and Etymology for Mansfield rule

after William Murray, first Earl of Mansfield (1705–1793), British jurist who set forth the rule

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