I'm in Microbiology this semester, and we had our first exam last week. We all assumed, before the prof showed up to hand out the exam, that we had to sit every other row, like we did in the same classroom last year for A&P 2. She came in, and had a completely puzzeled look on her face! She said SHE never said we had to sit every other row, and we could sit wherever we wanted. She then said she did not leave the room and was very watchful of everyone's eyes and heads during the exam. She was.
Totally different than nursing classes, where the only thing allowed by us were our pencils and calculators - no exceptions. When done with the exam, we had to leave the classroom and wait for everyone else to be done, then have the rest of the time as lecture. (I'm partial to the class being done when you're finished myself! I like that about our science prof's!)
Also, we're allowed to keep our exams in everything BUT the nursing classes. They're run through the Scantron, we go over each and every question thoroughly at the next class, but they go back to the instructor. We can review the exam whenever we want by making an appt with the instructor, and we can copy down from the exam anything we want, but we cannot remove the exam from the instructors office.
I've never witnessed any cheating during an exam, but then again, I'm focused on my exam, and don't care what others are doing. I would have no problem turning anyone in that I saw cheat or knew for sure was, though. I think that goes along with academic honesty.