This may be a stupid question, and I apologize if it is.
With the double slit experiment, measuring which slit the electron came through causes it to act like particle.
Instead, I wonder if it is possible to measure the direction that an electron came from once its gone through the slits, and just as it would act on the screen. If that were possible, would it cause the pattern to look like particles, or would it still look like waves? Would it matter if the "detector" was in a location that the detector was dark?