HUMAN SACRIFICE

The long and short of it... Yes. There is far enough evidence to substantiate the claim that the ancient Celts practiced and performed some form of human sacrifice. There is a great deal of evidence that these sacrifices were, however, voluntary in nature and that the sacrificed served as intermediaries, who took the petitions of their people directly before the God(s) of their clan.

In another mythology, one person's life is sacrificed so that a noble member of hierarchy would be healed of his terminal illness, thus showing a belief that one sacrificed would give way for another to be saved. The Romans recorded that Druids sacrificed humans, specifically condemned criminals often by placing them in human shaped wicker baskets to be burned alive.

Archeological records reveal a number of sacrificial deaths, such as in "Triple-deaths". In Triple deaths the victim was drowned, stoned, and impaled on a spear simultaneously. However, there is the theory that this was predominantely early christian propaganda to defile the humanity of Druids.
Julius Caesar had good reason to speak against the Druids since he was trying to conquer them at the time.

Druids today perform no such sacrifices as was referred to by Caesar and not only do we not believe in sacrifice, we do not advocate the killing of any living being unless in self defense, in the defense of loved ones, or sustenance of life. It is generally accepted in modern pagan culture that the greatest pagan principle is to harm none.
Most groups include themselves as part of the 'none'. In most common consensus blood sacrifices were discontinued long before the tenet of 'harm none' was ever indoctrinated. There are no authenticated evidences of Druid sacrifice beyond the first century CE, while the tenet of 'harm none' is accepted as dating from the late 19th century.

Today, our sacrifices consist of herbs, incense, flowers, oils, etc....