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It will be impossible to miss these - couldn't find one on the upper arm. What goes one way must go back the other some how to the lung.
https://www.reddit.com/r/interestingasfuck/comments/8nyriy/the_blood_vessels_in_your_armhand/
"A 23-gauge or 25-gauge needle is recommended for intramuscular administration of most vaccines (Plotkin and Orenstein, 2008)."
https://assets.publishing.service.g...ent_data/file/147915/Green-Book-Chapter-4.pdf
That's 0.515mm.
Capillaries are 5 to 10 micrometres (μm) in diameter, or 0.01mm. How would you stick a 0.515mm needle into a 0.01mm blood vessel to inject the contents into the blood stream?
Not all blood vessels are veins or arteries - the ones in muscles are much much smaller.
This is why muscles are used, and not just a random part of the body!