Oklahoma Presumption of Knowledge Based on Duty to Inquire is a legal concept that applies in Oklahoma to cases involving fraud or intentional misrepresentation. The concept holds that if a person has knowledge of a fact relevant to a transaction or matter, the person is charged with a duty to inquire further and make sure that the fact is accurate. If a person fails to make this inquiry, they are presumed to have knowledge of the fact and can be held liable for any damages caused by it. There are two types of Oklahoma Presumption of Knowledge Based on Duty to Inquire: constructive knowledge and actual knowledge. Constructive knowledge means that a person is presumed to have knowledge of a fact because they should have known it, while actual knowledge means that a person had actual knowledge of the fact. In either case, the person is charged with a duty to inquire further to make sure the fact is accurate. If the person fails to do so, they can be held liable for any damages caused by the fact.