Concentrate: It is prohibited to work as a guide when you have no licence. This rule holds almost everywhere in the world. This has become quite a big problem even for Slovak persons in Bratislava (I know that from direct personal experience, they were very strict with this) The local policeman (or ward or whoever) thought that this rule was broken in that particular case and therefore the non-guide was interrogated. That is all, an absolutely normal situation. The fact that the non-guide was a Hungarian is a coincidence (after all they are not the only Hungarian tourists in Slovakia), this is not the first case of such interrogations, and the fact that the policeman was probably wrong is also nothing special (although this is not sure, as far as I remember). The only "problem" of this case has been the reaction of Hungarian media.