Dr. Smith was testing false memories on a class of students. He used half the class as participants in his study. The other half provided true stories about events at the school. He used two of these true stories and one false story. Each participant read all three stories. Dr. Smith told them that the events were from his school days and that he was studying friendships. A month later he asked them to remember the facts. Mention the ethical guideline that Dr. Smith broke by telling participants that he was researching school friendships.