The lab technician finally noticed that I was redscaling the film.
winterschlaefer, untangleart, jeng, rik041, thejomi, alloftheabove, modern_nmt, 1122, atria007, hervinsyah, hhjm & clickiemcpete.
I tried to warn my lab the first few times but they didn't seem to care. So the emulsion scratch on the last roll I've scan I don't know if it from my reusable canister or their machine. Oh, Well.
@alburnkat I'd dropped off at least a half dozen redscaled rolls before this one. The clerk was scared he messed it up. Had a look of great relief when I said it was intentional.