What vein can you never draw blood from?

You can never draw blood from the jugular vein in the neck due to the risk of puncturing the carotid artery, which runs adjacent to it. Additionally, the jugular vein is often not used for routine blood draws because it is deeper and less accessible than veins in the arms. Instead, healthcare professionals typically use veins in the antecubital fossa, such as the median cubital vein, for easier access and reduced complications.