proffer letter

noun
variants: or proffer agreement

Definition of proffer letter 

US law

: a letter setting forth an agreement between a federal prosecutor and a person who is a subject of a criminal investigation stating that the subject will provide information to aid the investigation and that the information provided will not be used against the subject in the criminal proceeding Though an agreement had been informally worked out, the prosecutor's proffer letter made no mention of the plea bargain. — called also queen for a day letter

First Known Use of proffer letter

1980, in the meaning defined above

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The first known use of proffer letter was in 1980

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