I can guarantee you that an MD or RN injecting the gear we inject would definitely aspirate.
There are many innocuous anti-biotic and medicines provided at your MD’s office, but not gear.
They would aspirate what we inject and the quantities we inject.
If you inject into an artery, who knows, but if you inject in to a major vein,
Gear could go to and put your heart into fibulation , and possible arrest.
Fortunately the muscles don’t have LARGE veins, so it is very difficult to actually inject directly into a large vein headed for the heart. something that would almost have do be done almost intentionally.