> Surely that has to be thrown out in court?

The prosecutors likely know this and expect it. But there's enough gray area here for them to make the argument, and it's hard to prove malicious prosecution, so they know they'll get away with it. It's just about sending a message to the public - they don't care whether a conviction sticks. Just politics.

The prosecutors aren't on the hook, anyway. They have absolute immunity. The decision to charge is protected. The prosecutor would have to have done one of the few, enumerable things outside the scope of the role, like conducting an investigation without probable cause or hiding exculpatory evidence.