I'm a Hemo-Failure

I tried to give blood today, and once again, didn't make it past the screening process. They gave me a sticker to wear with the words "I tried, have you?" surrounding a bright red drop. This is to indicate to people that either I have lived in Africa, have low iron levels, have tested positive for a sexually transmitted disease, or have exchanged money or drugs for sex.

I'm wearing it now; I like to keep people guessing.