Im stuck at that exact part.

See, I just finished talking with Rosa, and now Im instructed to "search for more clues." Also, I know Im supposed to get a promopt at the bottom of the screen to "begin evidence examination." I also know that this is supposed to be triggered in the puddle of blood where the saw is located, which is what Im SUPPOSED to be examining. However, no matter how many times I play the mission, no matter where I go, no matter WHAT I do I cant trigger evidence examination on the saw. I even went to an online guide and looked at the exact pictures you take in the examination, and then took those pictures. Nothing.

So, do you think my disc is just *bleep*ed up? Or am I not standing in the right spot? please help me, this is more frustrating than you can imagine.

There might be something to examine first. I think I know where u are but try checking the cameras in the surrounding area. If this isn't any help just try looking around in the "examination mode" view until something pops up.

I think the problem was that he couldn't get to go into examination mode.Have you already completed it and forgot or have you something to do before you get that far,like did you do what the objective said on the pause menu?