I haven't given blood to the Red Cross in years, because last time they had some unqualified volunteer jab me with the needle into my arm and "miss" the blood vessel, nicked it, and blood began oozing out inside my arm. She asked if she wanted me to have her "try again" on my other arm, my dominant good arm, and I said "No way" and got the frick out of there. Couldn't move or bend my arm for 3 days, and had such a wickedly large bruise on my arm it looked like I'd been beaten by someone. Never again.