Lund asks Meyer about the DNA collected at the boiler room scene the night before. The question is indeterminate enough that it could be interpreted different ways, but Meyer's answer ("We're waiting for forensics.") implies that she wouldn't know basic police procedure concerning DNA samples, which doesn't make sense for the characters. This is what's known in the film industry as "exposition", which is information for the viewers rather than for the characters. In reality, modern forensic pathology laboratories are so busy that it can take months for the DNA from any given case to be processed. And even in high priority cases, such as this one, it takes no less than 50 hours - say four to five working days - for the full process of producing viable DNA results which can be submitted in court, and for the accompanying report to be written by the pathologist. The report is as important as the results, because it interprets them, and both of them together are critical evidence admissible in any ensuing court case. Both Lund and Meyer, as experienced detectives, would obviously know all this and not need to tell each other.
