It's very common. One example among many: https://www.propublica.org/article/prosecutors-dropping-child-porn-charges-after-software-tools-are-questioned https:

It's very common. One example among many: https://www.propublica.org/article/prosecutors-dropping-child-porn-charges-after-software-tools-are-questioned https://www.propublica.org/article/prosecutors-dropping-chil... Prosecutors are very aware of when they're on the grey side of the law, and when it's clear they're up against a defense that has a chance of clear precedent against them, prosecutors start acting much more conservatively.