According to Joe Nickell "Mumler was exposed as a fraud when people recognized that some of the supposed spirits were still among the living."
ジョー・ニッケル(Joe Nickell)によれば、「霊とされるものの一部がまだ生者のなかに居るということに人々が気づいたときマムラーは詐欺師として暴露された」("Mumler was exposed as a fraud when people recognized that some of the supposed spirits were still among the living")。