That is one of those "known unknowns". That is something you know you do not know that answer to and can never know. If I pick a random poor third world country and tell you they are you can never be sure I'm wrong - "all those villagers going to the river for dirty drinking have a phd equivalent in spying: they only go to the river when people are looking, the rest of the time they use the running water in the basement of the hut - I'll bet you didn't know those grass huts have mansion sized basement underneath with full electric: see how good they are". This of course completely bogus but you can't actually know that for sure.