Here's a idea, if they can do stuff like drain all the blood from a dog, then revive it 10 minutes later with little to no brain damage.
Then why don't we do this to a bunch of humans, and see what they have to say afterwards. We could confirm if there was a afterlife.
Would you do it if someone else went first and came out fine with no brain damage?
too many ethical issues involved for anyone to even begin. ie: what if the head continues to live afterwards, does it have a right to die again if it wants to? Or what if it was sparked back to life without ability to communicate, would there be consciousness in there? (there is already this going on with individuals who have locked in syndrome)
at what point does life end and 'death' begin? how can an experiment which intends to end life for a short period be ethically sound if you can't answer the first question?