An Affidavit is a sworn statement which must be signed in front of a notary public. After the Affidavit of Service is done, it must be filed with the Court.The undersigned affiant,. Learn how to craft an effective affidavit letter with our sample and essential components. An affidavit is a sworn statement. It carries the same weight as a statement made in court under oath. Making an apparently sworn false statement in the first degree is a class E felony. A sworn statement is a legal document that details important facts, evidence, or the statements of parties involved in a specific court case or legal matter.