if you talk to doctors (my dad is one), they'll tell you that aspirating is a poor technique. when you aspirate, sometimes you pull the walls of the blood vessel together, and see no blood in the syringe, but are still in a vessel. he said the safest technique is to just touch the plunger back, so as to create a very mild suction, and/or move the needle in and out as you inject, spreading the oil pocket out, so that no matter what, very little will get into a blood vessel. also, spreading an injection out over a larger area, will decrease the time it takes to get the steroid into the bloodstream.
-beefy