To my knowledge, the pineal gland is responsible for the release of dimethyltryptamine (DMT) upon death. Would it be possible to force the pineal gland to release this DMT while still living?
According to this page the release of DMT upon death is speculative and its presence has so far been confirmed in rodents brain and human melanoma cell line SK-Mel-147. DMT is also produced in humans; however, its production and purpose in the brain has yet to be proven or understood (http://en.wikipedia.org/wiki/Dimethyltryptamine). Hence from what I have gathered on the matter DMT has not yet been proven to get secreted from human pineal gland and its command based secretion is yet to be discovered.