CSI Crime Scene Investigation

The CSIs question a young man who is found covered in blood in the street. The man believes he has murdered someone, but has no memory of who he is or who he might have killed. Is his amnesia genuine?

While investigating an elderly woman's murder, Grissom receives a miniature crime scene replica; Greg attends a hearing to ascertain his culpability in a teenager's accidental death.

When identical twins are found dead, the evidence in both cases does not immediately prove a connection between the two deaths.