A friend of mine had a proctor report written against him on Level 1 exam. It stated he didn’t close the book when instructed. Only one proctor wrote a report, report was vague and poorly written. He replied to them saying wtf (in a polite way) and they cleared him of any wrongdoing. He also completed exam with pen - amazingly, it wasn’t a problem at all.
Guy next to me at LI exam brought the wrong type of calculator. If you get all the way to the exam without realising there are strict conditions on what can be used then you certainly have bigger problems than the CFA.
To his credit, he actually sat the whole thing (morning and afternoon) without a calculator. Don’t imagine he had a very good Saturday.