Chapter 5 eyewitness deception: both the police and the courts rely on eyewitness evidence. Eyewitness testimony is one of the most compelling types of evidence presented in criminal trials: a large part of eyewitness testimony rests on memory. To study memory using laboratory simulation, unknowing participant views a critical event, such as crime, either through a slide sequence, video recording, or live. Then the participant is asked to describe target/culprit involved and etc. Independent variables: can be either estimator or system variables. A lineip is a set of people presented to the witness, who in turn must state whether the culprit is present and, if so, which one. There are voice lineups and even clothing lineups presented: primary goal for an officer interviewing an eyewitness is to extract from the witness a complete and accurate report of what happened. Insufficient information may provide the officer with few leads to pursue, resulting in a case that will not be solved.