For example - what do they mean by "know"? What you think it means can be very different from how the investigators interpret it. Do only close friends and associates count? How about that co-worker who sits three cubicles away from you, who you don't consider a friend but talk about football with a few times a week while waiting for the coffee machine? Or the barista at Starbucks who has seen you every morning for the past 3 years and 'knows' you well enough to ask how you family is doing?

And then - what do they consider a foreigner? Anyone who has born in a foreign country, even if they are a citizen? Or landed immigrants? Or only people who currently reside in foreign countries?

It would be easy for someone to believe they were honestly answering 'no' to the question without realizing their assumptions about what is being asked are incorrect.

I don't blame investigators for asking questions like this, but people should think very carefully about answering the questions without legal counsel. There's usually just too much ambiguity in most questions (even simple ones) to be able to comprehend all of the possible meanings and implications of every word. Relying on your ability to recall things on-the-spot while being questioned in a high-stress situation also seems like a bit of a lose-lose proposition.