Yesterday I injected for my friend. I cleaned the spot, injected it, then I aspirated. When I aspirated I saw the juice bubble. So I figured I was all good to go, so I injected. When I pulled the needle out it started to bleed right away I looked the needle and there looked like there was a little blood in it. Why would there be blood in it if I aspirated and no blood was in the gear. He was shooting winny so i would of seen it in the milk.