I was watching a Police show and they couldnt prosecute a drug driver because they couldnt get a blood sample from him because of his drug use. Why (and this sounds really sadistic) can’t they take blood extracted another way?
In: Biology
The veins and arteries are where all the blood is. You can get a few drops in other places but if you want to take a significant amount, you should really find a blood vessel which carries a significant amount of blood.
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