There is the concept of malicious prosecution ( https://en.wikipedia.org/wiki/Malicious_prosecution ), but that only applies when the prosecutor pursues a case without proof of even the basic elements of the crime. If they filed charges that they were incredibly unlikely to prove (which is what I heard from all the commenters on this case: “the prosecution has a hard case to make” or something similar), then they spent a lot of time and money, caused somebody to spend a lot of money for the defendant, etc., but they didn’t cross the line into malicious prosecution.