maybe if every poster, that will get out on a public surface, should get a city (or whatever legal entity) issued mark/stamp on it... like some products have al

maybe if every poster, that will get out on a public surface, should get a city (or whatever legal entity) issued mark/stamp on it... like some products have already, cigarettes, coffee etc. (for taxation/anti-smuggling purposes). That could alleviate false poster issue and be cheap to implement. Might as well earn some cash for the city to keep those surfaces clean / lit or whatever.