One criticism of Project Serpo stems from the lack of veracity of one of its alleged witnesses, Sergeant Richard Doty. Doty has been involved in other alleged UFO-related activities (see Majestic 12 and Paul Bennewitz), and thus is a discredited source (or a purposeful provider of disinformation). Additionally, there is no physical evidence supporting the project's existence. According to Tim Swartz of "Mysteries Magazine", Doty, who promised evidence to Moulton Howe before backing out, has been involved in circulating several other UFO conspiracy stories. Swartz also expressed that the details of Project Serpo have varied considerably with different accounts. It has been alleged that the entire series of posts were designed to be viral marketing for a new book by Doty.