Hey guys, can someone help me with this. I have used the following paragraph for these "Hidden" evidences:

• Chapter 2: Investigate the button on the elevator in the basement for a fingerprint.
• Chapter 2: Before you move the locker at the end of the level, check the door for scratches.
• Chapter 4: Extremely hard to miss, but by the end of the level, you have to check the map twice. Once a wide-view picture (required), the second a close-up on the circled area ("hidden").
• Chapter 8: On the left wall of the first corridor for a stain of blood.

I have done all of these and got nothing. Do you need to complete the levels again to do it? Let me know if anyone knows

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Big Baller and member of the Mile High Club and Perkaholics Anonymous .... bring on more Zombies

I had missed the second evidence on the 2nd level the first time I played through. I just loaded up that chapter and replayed the level getting all the evidence again. It didn't pop till after the level was done.

If you went back and did them all again then  maybe you missed another one. That would suck.

Chapter 8: On the left wall of the first corridor for a stain of blood.

??????

Which wall, not the corridor you start the level off on ?