Among the original evidence in the shooting death of Officer Steve Schoenfeld is a pair of rubber gloves that were suspected to be worn by the murderer. Ten years ago, no DNA was recovered from them, and no gunshot residue was found on them. But Bloom notices in the case file that they were not tested for anything else. He decides to find out what they were used for before their purpose in the shooting. The lab results lead to Lucas believing he now knows what the murderer did as a day job. And as Flynn is rushing through the office, Lucas picks her brain about what he sees as a similar case on which she previously worked.