Alabama voters head to the polls for the November midterm election next month. One issue on the ballot would do away with slavery. It’s still allowed in the state constitution. Alabama Public Radio news spent nine months looking into one lingering aspect of the slave trade. APR’s focus is on finding and preserving slave cemeteries in the state. By the time of the Civil War, an estimated four hundred thousand people were held as slaves in Alabama. Some accounts put the number throughout the South at closer to four million. That would appear to make the issue of slave cemetery preservation a southern issue. But, that doesn't appear to be the case. Here’s part four of our series we call “No Stone Unturned."