Psychologists have long known that our memories of past events can be influenced by misleading information, but now they have proven that doctored video evidence can convince people to offer false eyewitness testimony. In a study of 60 college students performing a computerized gambling task, nearly half were willing to testify that they saw their partner cheat in real life after watching fabricated video evidence. The students that knew video evidence existed but did not watch the footage themselves, only 10 percent gave false testimony. The researchers emphasized that no one should testify unless they are absolutely sure their partner cheated.
Reference: Wired
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