The ability of the investigator to recognize and collect crime-scene evidence properly depends on the amount of received from the crime laboratory.

Training.

Explanation:

The ability of the investigator is completely proportional to the amount of training he or she has received from the crime laboratory. Given the variety of items that must be checked from a crime-scene (for example: Fingerprinting, Biology, Chemistry, Firearms and toolmark identification, etc), the training of the investigator is key to finding evidence and, eventually, solving the crime.

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