How do college professors make sure students don't cheat?

Anonymous
Nowadays, a student can easily look up answers online. Sometimes I Google one question, and the entire test or quiz pops up on Quizlet. It's too easy at that point. Even with an app called Lockdown Browser, where you can't open a new tab, you can take the test on your laptop and search for answers on your phone. The teacher will have no clue. And what about hiring someone from a essay-writing website to do your paper? There's so many ways to cheat.
How do college professors make sure students don't cheat?
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