According to the Death Penalty Information Center, at least 186 people who have been sentenced to death in the US were later exonerated as a result of improper convictions, 100 of whom were Black.
South Carolina has brought back the firing squad as a method of execution, making it one of the few US states where it is lawful to carry out a death sentence in that manner.
According to the state Department of Corrections, it will be possible for inmates on death row to choose to be shot among three execution options.
They will be allowed to decide whether to die by lethal injection, death by a firing squad of three men with rifles, or the electric chair.
The US – alongside the likes of Iran, Egypt, and Saudi Arabia – is one of the few countries that still permits capital punishment. It and Japan are the only G7 countries to do so.
Many states in the US do not permit capital punishment.
Three inmates in Utah have been executed by firing squad since 1977, according to the Death Penalty Information Center (DPIC).