Doesn't this have to work 100% of the time if you rely on it? I mean if it works 99% of the time your odds are low you'll make it thru a year. It seems like a c

Doesn't this have to work 100% of the time if you rely on it? I mean if it works 99% of the time your odds are low you'll make it thru a year. It seems like a cool idea, but the mechanism does seem like it would work not every time.