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Watch and learn, how tickets are properly checked on Lviv and most Ukrainian trams. As seen in video "Ticket check what to ask" the inspector should show you his documents. You have the right to demand the documents. As always, as a foreignor who does not speak english you have the right to ask for a translator. Usually, just saying- "Do you Speak English" to any official in Ukraine, is sufficient to upset their stomachs and go to seek easier prey.