OK, perhaps I should have said, rigorous, testable, repeatable verifiable empirical evidence that can be produced and reproduced at any time in controlled conditions.

The deceptively similar accounts of Near-Death Experience (NDE) are invalidated by the fact that most of these come from the US or Europe and fit the cultural norms and expectations of the people involved. Would a Viking undergoing an NDE experience a tunnel with a bright light at the end, or would he see a blonde mezzo-soprano on a winged horse coming for him? Would an Ancient Greek see deceased family members waiting for them, or merely Hermes Psychopompos waving him on?Nobody knows.

We know that the brain reacts in odd ways during cardiac arrest, and sometimes when life-support is removed, a flatlining brain can show spurts of anomalous activity. As yet, nobody knows how and why this happens, any more than we know why some people can recover from hours-long cardiac arrest whilst others succumb in seconds and cannot be revived.

Spiritualism in the sense of communicating with the dead is a profitable meeting of charlatans with the gullible. Even those 'mediums' who may be actual Psykers are getting their knowledge from the living minds of the seekers, not the dead ones of the sought.

While I don't think that science is the whole truth, I respect it as a methodology. To test a claim as great as life after death requires the most rigorous application of that methodology. Thus far, none of the 'evidence' put forward stands the test.