DALLAS (AP) — Evidence from the trial of a former Dallas police officer convicted of killing her neighbor has fueled new questions about whether accused officers are treated differently than other suspects, including testimony that a camera in the cruiser where the officer sat after the shooting was flipped off and that her sexual text messages with her partner were deleted.

Even as Amber Guyger begins her 10-year prison sentence for murder in Botham Jean's September 2018 death, testimony in her case has prompted demands for the head of a police union to step down. It also has led Dallas Polic...