Christa Pike regained consciousness after Tennessee authorities gave her two pentobarbital doses during a failed execution. The case has raised fresh questions about whether the drug entered her bloodstream properly and about the risks of lethal injection.

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.