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In the final scene of The Departed when Sullivan (played by Matt Damon)returns to his apartment he finds Dignam (Mark Wahlberg) waiting wearing gloves and hospital moccasins and pointing a gun at him. Dignam just walks off after shooting Sullivan. What was the significance of the gloves and moccasins? If Dignam was taking precautions for not leaving any evidence or sign on the murder site, then how did they help? Or is there some other reason?

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You never watched CSI, did you? ;) –  Sonny Burnett Jan 6 '13 at 21:10
    
Not much, but now I see what you mean ! –  Qrious Jan 7 '13 at 4:39

1 Answer 1

up vote 5 down vote accepted

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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