You will recognize them by their face masks
How can you be sure that the person who rings your doorbell is an enumerator?
First – the enumerator must show their official card, on which there are their photo, three names and identification number given by NSI.
Second – the enumerator must inform you clearly about the goal of the census and show you a questionnaire which has on its back a letter by NSI President where the goals of the census are described.