That's why I could care less if he tried to cheat on a test.
1. Having a cheat sheet is useless if you don't understand the material to begin with. You won't know how to apply the information. Need proof? Give someone with a poor understanding of calculus a cheat sheet on differential equations and ask them to solve a differential equation. It's not happening.
2. He's only cheating himself. He's not cheating the other students. His grades have no bearing on the other students' abilities to perform well in the course and learn the required material. He isn't denying them a thing, unless he broke a curve, which I highly doubt.
3. If he gets caught, he's kicked out of the university. If he's willing to risk his future who am I to stop him?
We'd like to think all cheaters fail, but I know plenty of rotten a-holes who get ahead. It doesn't make it right, but I know of one guy who cheated in college, cheated in law school, cheated on the bar exam, cheated on his wife, cheated elections, cheated the electorate, cheated other politicians, is a multimillionaire and happy with his life because he found God. Come to think of it, he's one rotten son of a ***** and I hate his guts but that doesn't keep him from prospering financially.