On the other end of this I include "Staying Hydrated" as a skill in my CV so as to increase the chance of detecting whether the person who's interviewing me received the original version, something doctored or someone else's CV entirely.
One time they didn't receive my CV at all, because apparently this was the extent of paranoia the consultancy through which I was hired was exhibiting.
How do you distinguish between those who have and those who haven't received the original? I'm going to hazard a guess that "Staying hydrated" is sufficient obscure that they ask you about it.
I count on that, but last time I asked if they could find this phrase in the CV.
Of course this gives no protection against inserting unauthorized entries, but my experience so far is that recruiters either send the original CV or go all out and change whatever they want.
One time they didn't receive my CV at all, because apparently this was the extent of paranoia the consultancy through which I was hired was exhibiting.