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If testing is done on all blood and is 100% accurate (I doubt it is), then why would they ask anyone anything prior to giving blood?
I suppose if you were to take blood from a high risk group and granting that testing works 100% of the time, then you are more likely to waste time and resources since the blood would have to be rejected. That's all I can think of.
The other possibility is that the testing is not 100% and an increased chance of receiving contaminated blood means an increased chance of it making its way into the system. Then it becomes a matter of what the odds are and how much you are willing to gamble.
I suppose if you were to take blood from a high risk group and granting that testing works 100% of the time, then you are more likely to waste time and resources since the blood would have to be rejected. That's all I can think of.
The other possibility is that the testing is not 100% and an increased chance of receiving contaminated blood means an increased chance of it making its way into the system. Then it becomes a matter of what the odds are and how much you are willing to gamble.