 In opposition to this idea, other pointedly skeptical scholars note the lack of any solid evidence and stress the collective rather than individual character of initiation into the Mysteries.Indirect evidence in support of the entheogenic theory is that in 415 BC Athenian aristocrat Alcibiades was condemned partly because he took part in an "Eleusinian mystery" in a private house.Many psychoactive agents have been proposed as the significant element of kykeon, though without consensus or conclusive evidence.