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A friend of Adnan wrote a letter to him saying she saw him in the library the time of the murder. This would make Adnan have an alibi

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The phone booth that Adnan was said to call off of after killing Hae had no record of ever being present.

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Sarah Koenig, the narrator, drove through the timeline of the 21 minutes and found herself with only 3 minutes to "kill" and put the body in the trunk with no one seeing. It takes a few minutes to strangle someone to death which means the 21 minutes would not have been long enough for Adnan to commit the act.

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The story told by Jay that was the key information used against Adnan, changed on many occasions.

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Adnan and a few of his friends  mentioned that they had no understanding of where Leakin Park was.

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Adnan only had one persons story against him: Jay's story. This story was essentially what put Adnan behind bars. This was not concrete evidence.