What exactly are you classing here as 'cheating'? I've now done 2 out of three ISAs (and will soon be doing my last) and in both of them my two separate teachers have written on the board the information that wasn't really relevant, then said, and only said what we were allowed to write on our candidate sheets as they were 'not allowed to write it down'. They then showed us all the necessary things we needed to know for the exam on a slide show, and we wrote them down on separate sheets of paper to take home and revise from. Are you saying this is cheating?
In saying that, I saw multiple people around me cheating in my physics ISA (I wasn't paying attention in biology,as I was trying not to panic) - and by that i mean ACTUAL cheating: using phones or reading answers from pieces of paper etc. I believe that they are ridiculously easy to cheat on, although I personally never would.