Yes, there have been multiple people who are believed to be innocent and been put to death. Cameron Todd Willingham of Corsicana, Texas was put to death because he was believed to have killed his 3 daughters by starting a fire in his home. Later on many people cast doubt on whether the evidence that he started the fire was sufficient enough to convict him of the murder.
Some people who had been killed using the death penalty have been found not guilty after the fact.
Over 1,000 people have been killed since the death penalty was instituted.
The exact number of wrongful deaths due to the death penalty is difficult to determine. However, various organizations and studies have presented evidence suggesting that there have been cases where innocent individuals have been wrongfully executed. The Innocence Project, for example, reports that since 1973, over 170 individuals sentenced to death have been exonerated.
People who have been legally adjudged insane.
There have been almost 1300 executions via the death penalty in the United States. About 1264 of these executions have been since 1974.
Of course, death penalty are sentenced to people who have done serious crime regarless of their race
The death penalty is legal in 32 U.S. states. In the United States, 1,386 people have been executed.
Actually, opinions on this vary. But the tendency, nowadays, is that a majority of people think that the death penalty is uncivilized. Some arguments against the death penalty is that it is used disproportionately against ethnic minorities (for example, black people in the United States), and that it is irreversible (and there have been many cases where people executed, or people who were planned to be executed, turned out to be innocent). For further arguments, both for and against the death penalty, I suggest you consult the Wikipedia article on "Death penalty".
It is where prisoners who have been given the death penalty are housed. The purpose is to keep them out of the general prison population.
Yes, the death penalty has been totally abolished in the UK. It was abolished in all cases in 1998
People have been killing people for one reason or another well into pre history The word penalty was added to give the activity some sort of respectability.
There is no way to know for sure. Actually, there is no evidence to suggest that any innocent person has actually been killed by the death penalty. In fact with DNA testing the chances are close to 0 that any innocent person will ever be killed by the death penalty. Since 1973, over 130 people have been released from death rows throughout the country due to evidence of their wrongful convictions. In 2003 alone, 10 wrongfully convicted defendants were released from death row.