Hello there, @sharmsen ...
There are products such as the Respondus LockDown Browser which integrates with Canvas that prevents you from accessing other sites/content while taking a Canvas quiz. Of course, if a student was sneaky enough and had a smartphone with him/her, that might complicate things a bit. There is even a Respondus Monitor component that has some other technology to try and prevent cheating. Those are the main two that come to mind, and you'd want to have a conversation with folks at your school (such as your school's local Canvas administrator or someone from your school's Online Learning/eLearning department) to see if purchasing products like this would be possible.
I hope this will be helpful in some way. Sing out if you have any other questions about this...thanks!
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