I do. I think its a good idea to just get in the habit of aspirating. I am sure some will argue and say its not necessary...and hey maybe its not but its a good habit. I can tell you for sure that if I were to inject slin you can bet your ass I would aspirate...I damn sure wouldnt want that to go IV on me.
Very good question. I think a lot of people would wonder the same thing. I have done slin and b-12 sub-q and I always aspirate. No matter what if I am injecting, I want to make sure it isn't going in a vein. I would do it just to be safe bro. It only takes a few seconds.