I may be beating an old horse with a stick on this question, but the last thread I found was from 2010....and well... we all know medicine can change drastically over almost 10 years. SO... in school I was taught to NOT aspirate (draw back to see blood flash back) before injecting in an intramuscular injection. Our teacher said there is not evidence to support the use of it. Is our school right? I found that the CDC does not recommend this practice for vaccinations... but what about just plain old medication administration? What do yall do and what are your thoughts?