The questioning you go through every time you donate Plasma is like being grilled by a police Sargent, except done by a much friendlier nurse.
Have you had sex for drugs or money in the last x months?
Have you had a tattoo or a piercing in the last x months?
Have you been in jail or prison for the last x months?

I had some fun once with a nurse who was good friends with my wife and I by then. I did IT work for the Dept. of Health at the time and the local prison was part of our jurisdiction so when she asked if I was "in prison in the last x months," I replied honestly, "Yes, I just left there to come here." First time I saw a jaw drop in real life.

With great power comes Awesome irresponsibility.