I can't speak for other schools in the US but I am an undergraduate in the CS department at Stanford, and it's fairly common to have an open-computer test to re

I can't speak for other schools in the US but I am an undergraduate in the CS department at Stanford, and it's fairly common to have an open-computer test to refer to notes and the textbook. Other students sit around you and it's most likely fear of another student approaching a TA that makes this enforceable.