Interpersonal deception detection between partners is difficult unless a partner tells an outright lie or contradicts something the other partner knows is true. While it is difficult to deceive a person over a long period of time, deception often occurs in day-to-day conversations between relational partners. Detecting deception is difficult because it places a significant cognitive load on the deceiver. The deceiver must recall previous statements so that their story remains consistent and believable. As a result, deceivers often leak important information both verbally and nonverbally.