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They have tried to cheat. Check out:
https://www.popularmechanics.com/science/a22280/double-slit-experiment-…
And watch the video. It's really only about the first half of the video, but it's extraordinary. They did some nifty attempts to cheat only to discover that they couldn't get around it, and the results just got weirder -- as if effect preceded cause. They first split photons into entangled pairs to be able to measure which slit each came through, but it didn't work. Then they delayed the results of the split photos on the right-side slit so that the left-side slit photons would arrive first. But even when they did that, it was as if the photons on the left knew what was up and adjusted how they behaved. Very bizarre!