Do banks check your rolled up coins?

I am from Canada. If I roll up some coins and give them to the bank to exchange for paper money, do they check the coins?

If they check them, what method do they use? Do they weight it or do they break them up and check them one by one? I want to know if I can slip in some American coins in the rolls, because US money are not worth as much as Canadian money, so I wonder if I can make a few bucks using this method. I have a lot of US coins from traveling to the US.

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