Witnesses' statements can greatly affect how cases are decided, but their remembers will often be wrong and are at risk for being swayed by outside influences, such as leading questions or discussions with other witnesses. Evidence in psychology has demonstrated how errors in eye-witnessing by witnesses can create innocent people being wrongfully convicted.
Improvement of eyewitness line ups can be achieved using fair methods of administration, such as double-blind and sequential methods. There are also biasing effects that play a role in how a person remembers: forgetting parts of memories, schematic bias, and the tip of the tongue effect, as well as the likelihood that inaccurate information may be suggested to them; thus creating a seemingly accurate memory that is, in fact, incorrect. These biases can help a person approach the information they are recalling more critically.