You’re right. He wore the shoe covers, gloves, and a hair net to not leave traces behind, what is called “cross-contamination”. This just improves his chances of not getting caught.
More info and pictures via here
"Biological evidence requires care to guard against the possibility of cross contamination either by the investigator or by other biological specimens at the scene. Equipment is available to crime scene investigators which aide in the prevention of cross contamination. Types of equipment include:
Tyvek white paper body suit
Paper mask that covers nose and mouth
Eye protection
Latex or Nitrile gloves
Sleeve protectors
Shoe covers
Hair net"
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