An affidavit is the written equivalent of verballygiven court testimony. An Applicant Affidavit is a legal form used to provide additional information regarding crimes, negative actions, and applicant selfdisclosures.A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. To ask the Court to appoint a lawyer, please fill out the Motion for Appointment of. Counsel form and the Financial Affidavit. It is the main way you present evidence (the facts of the case) to a court. The Legal Terms Glossary defines over 100 of the most common legal terms in easy-to-understand language. This article explains how to draft declarations in support of a Washington State divorce or family law motion, such as a motion for temporary orders.