Well, I made the freaking drive home and waited around until the day I was to get stabbed again. Turns out that there was a scheduling mixup on their part so that the whole thing was pushed back for around 3 weeks. This past monday was the 2nd PPD and thursday morning at 6:30am I was off driving again. I've basically got an identical sort of mark on the arm, no different from what I can tell than last time. After a short parade of doctors I was told that the test was positive and that I no longer qualified and that was it. Fuckers. $90 dollars out of pocket for the PPD shots and around 420 miles traveled in total for this piece of shit study. Within 10 minutes I was out of there and back into the car and on my way back.