I think they would just make something up if they wanted someone and there was no applicable crime. I would actually feel better about knowing I would be accused of something I actually did and that there is nothing wrong with, rather than having to worry about them planting child porn or framing me for murder. Governments don't care about truth and framing people is usually quite simple, but if the truth is enough and they don't need to harm my reputation, it would probably be even simpler for them to go with the truth.