You might be interested to learn that eye witness testimony, despite being so popular with jurors, is one of the least reliable forms of evidence that is used in courts of law.
You may be interested to read, for example, this excellent article about the problems with eyewitness testimony. Or this section of the Wikipedia article about witnesses. Each cite several studies which show that witnesses are not nearly as useful as you'd like to think.
Human memory is, unfortunately, painfully flawed.
You're missing the point. The point wasn't that court witnesses are always reliable, but that, in the absence of evidence that they're unreliable, we presume that they are reliable.
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