Aspiration
In this one...I've got to take a shot...sorry guys...
Not aspirating is just plain stupid.
You're risking pulmonary embolism, stroke or heart attack, all of which could be caused by not aspirating.
I'm in the med field in the past...we always aspirate...when you say you've never seen a doctor aspiration...that could be because they are using water base or something like that but probably you're just not *seeing* him aspirate...he's aspirating if he's doing an IM shot. He probably has given so many of them that he's just good and quick at it.