Proffer
In federal criminal cases, cooperating with the government is commonly known as a proffer agreement, interview, proffer letter, or a “Queen for a Day” letter.
A proffer agreement is a written contract between a federal prosecutor and defendant, or a person under a criminal investigation, where they will make an agreement to give the prosecutor useful information. Their statements won't be used against them later in a criminal proceeding.
A proffer agreement is a written contract between a federal prosecutor and defendant, or a person under a criminal investigation, where they will make an agreement to give the prosecutor useful information. Their statements won't be used against them later in a criminal proceeding.