I see a lucrative business for enterprising individuals: private blood banks. Probably unConstitutional.
Already in place.
Prospective surgery patients can donate pints of their own blood in the weeks prior to surgery.
Well, I see myself refusing to give blood to the blood banks if this policy is rescinded. I can never or rarely anticipate when one of my friends or loved ones will need my Type O untainted blood and they would definitely get firt crack at it.
or its an easy way to kill political enemies.
Yep. On a previous thread on this topic, I proposed starting a business selling certified sodomite free blood, for many times the price of the politically correct, but potentially lethal stuff. Nearly every patient would pay the premium for the safe blood.
Not necessarily. I've heard of people banking their own blood, but it's very costly. (Remember the Seinfeld episode where Kramer made a 'withdrawal' to keep in his own freezer?)
That, and the accessibility to your own blood products on short notice impose obvious limits.