Better living through science

I've fallen back on being a guinea pig in order to make some cash. I don't think I'll ever get desperate enough to subject my body to drug testing, but psychological exams will do. Took part in a study on mental health the other day and made $40. Came back this afternoon for a study on the physiological effects of stress. Went all the way uptown only to find out that the metal in my leg made me unsuitable to participate (there were slight shocks involved). Fun. I get paid (by money order, since they apparently had no cash on hand), but making the extra trek was no fun. Oh well.