proffer letter

noun

variants or proffer agreement

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

Word History

First Known Use

1980, in the meaning defined above