Tennessee inmate Christa Pike survived two lethal doses of pentobarbital after a failed execution due to possible drug leakage or degraded medication. Read more at straitstimes.com.

A look at pentobarbital reveals why the barbiturate used in Christa Gail Pike's failed lethal injection may not have reached fatal concentrations.

A catheter carrying the drug may not have delivered the doses to Pike’s bloodstream, experts said. The drug itself may have been degraded.