The disciplinary policy at Commerce allows only one punishment for "violation of 'no-strike' affidavit": removal. An affidavit is a type of legal document that contains a written sworn statement.An affidavit is a formal written document in which the signer swears under oath that the statements in the document are true. A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. An affidavit is a written statement made under oath that is typically used in legal proceedings. Learn their purpose, when to use, and how to write. It means you should not write anything that you know is not true.