Also, I have to mention this. Today I went through my third playthrough, and I tried to do the trials differently. I failed the first one after about a mile of driving, I completed the second one, and then I thought I would put myself first, and back away from the third one. It made me feel pretty bad actually, but when I got to the fourth trial, my attitude had shifted more into line with that of the third trial, and when it came down to it, I felt nothing but contempt for the drug dealer, and I had no issue just killing him. I scared myself a bit there actually. Finally, I didn't drink the poison (again, putting number one before everyone else), and so I couldn't figure out the address.
My biggest disappointment in that regard, was that when I got to the warehouse (Madison called and gave Ethan the address), the ending was exactly the same as my second playthrough. Scott was praising that I had sacrificed myself to save Shaun (wtf?), and he almost shot me while I was opening the grate (saved by Norman). The only difference from my last playthrough was that I didn't manage to get Madison inside the warehouse, so Ethan was gunned down when he came out (DAMN YOU BLAKE! DAAAAAAAAAMN YOOOOOU!)