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The Petrified Forest National Park in Arizona has the largest collection of petrified wood in the world. The beautiful wood is more than 200 million years old, and visitors to the park often take a little piece home with them as a souvenir. But stealing the wood has serious consequences, both legal and, some say, supernatural. 

See photographs of the conscience letters and learn more about Ryan Thompson's book here. 

For a transcript of this episode, send an email to transcripts@thisiscriminal.com with the episode name and number. Say hello on Twitter, Facebook and Instagram. Sign up for our occasional newsletter, The Accomplice. Artwork by Julienne Alexander.

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