The surveillance as a mistake
Shoot some blurry photos of protesters, make a poster, put out a 500 Euro fine for identification of each person shown on the photo and put every one to trial that gets identified by someone who thinks that he knows who the person in question is. Thats the ritual the german police is doing at the moment to "identify leftist protesters that made illegal things at a demonstration against NeoNazis in Potsdam". The problem? Mogreens got wrongly identified (he is supposed to be Nr.20) - even though he was in town and is a little lefti he did not take part in the demonstration and the photo they are referring to is so surely not him thats ridiculous to even think it might be him - yet he has to appear before court and defend himself.
What gives? Surveillance of any kind is shit and surveillance with help of greedy ordinary people is absolutely unreliable. I would think about a litigation process against the wrongful "witness" claiming the money for the lost time - but I guess you wouldn´t stand a chance against bigo brother and his little helpers.