You could store and use your own blood and it would not be "elsewhere".
Well I remember clearly only a few years ago this was not the case. The scripture was something about blood being poured on the ground. It was even suggested that Dialysis was a matter of conscience as one could consider the machine as an extension of the circulatory system.
This could be the start of a reversal, stop issuing the cards each year (which when I was a JW was policed by the group study elder), then less and less publications on the subject, when people start to forget, issue a short article with the new light. (The old light fades before the new light is switched on)
Seemed to work in 1975.....
A