How does one calculate?

How does one calculate the number of illegal aliens in a nation if they're in hiding? And how does one calculate one's success rate at a border without knowing how many successfully got in? I don't buy Trump's claim of having achieved a 99.9 efficiency rate in stopping border crossings. Exageration is his signature style.

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ArishMell · 70-79, M

It is very difficult, to say the least. They might make an estimate from the numbers found, but it can never be so accurate that anyone can make sensible numerical claims to one decimal place!