How does Facebook provide private DMs to prosecutors if the messages were end-to-end encrypted?

Facebook recently provided Nebraska police the chat history between a mother and a daughter to prosecute them for abortion ([Link](https://www.vice.com/en/article/n7zevd/this-is-the-data-facebook-gave-police-to-prosecute-a-teenager-for-abortion)). But the Facebook messenger is said to be end-to-end encrypted, meaning Facebook can't access the message contents. Then how did the submit the messages to the police?

encrypted end end-to-end facebook messages privacy