The reason they don't bother to aspirate is one that they know the proper sites and that there isn't many veins or nerves in those sites and two it is really hard to poke a vein when you go in at 90 degrees; they tend to just roll aside. If you were to increase the pressure in the vein (with a tourniqet or something) like they do when they take blood it would be a different story.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.