How does the accuracy of the evidence in the investigation affect the forensic examiner's work?
Records such as medical or psychological is absolutely crucial to the forensic psychologist's work. To build an accurate picture of the offender's profile requires all the best evidence.
There really is no difference in the level of detail needed in both forensic science and psychology, an investigation might hinge one piece of evidence for instance a fingerprint. And this is exactly the same for psychological evidence especially when thinking of culpability.