How a Genetic Trait in Black People Can Give the Police Cover

When they carried the body of a 32-year-old Black man named Lamont Perry out of the woods in Wadesboro, N.C., there were no protests over his sudden death in police custody.

No reporters camped at the scene. No lawyers filed suit.

Instead, the final mark in the ledger of Mr. Perry’s life was made by a state medical examiner who attributed his death in large part to sickle cell trait, a genetic characteristic that overwhelmingly occurs in Black people. The official word was that he had died by accident.

But the examiner’s determination belied certain facts about that night in October 2016, public records and interviews show. Accused of violating probation in a misdemeanor assault case, Mr. Perry was chased by parole and local police officers through the dark into a stand of trees, where only they could witness what happened next.