Funny you should post this question. Just today, I was thinking about it. I have NEVER had ANY medical person do ANY aspiration for ANY injection on me or anyone I have observed getting an injection! NEVER! I got an injection a few months ago of a steroid (not the good kind) in my butt and the nurse just jammed it in. (On a side note, she told me that it wasn't going to make me look like Arnold!)
Any way, when getting injections of anything or observing anyone else getting an injection, intramuscular or otherwise, I have never seen anyone aspirate. Any idea why this is?