Lethal injection is commonly thought of as the most painless method of execution. But now many lawyers and doctors are looking inside the bodies of executed inmates and making the case that lethal injection could amount to torture.

To take a closer look at this claim, NPR producer Noah Caldwell and a team at All Things Considered obtained more than 300 inmate autopsies through Freedom of Information Act requests. It's the largest collection of lethal injection autopsies in the U.S. They found that more than 80% of the inmates may have experienced the sensation of drowning.

Read and listen to the entire investigation here.

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