The Karen Read case is back in a Massachusetts courtroom on Monday as the trial enters a fifth week with an 18th day of witness testimony. A forensic analyst for the prosecution is going over the movements of Read's Lexus SUV on the night in question.

According to our Boston affiliate WCVB, the tail light DNA came from three separate people, including at least one male. The sample was a “strong match” for Boston police officer, John O’Keefe. Bradford explained the hair sample found in the back of the SUV did not give enough DNA to identify it.

Prosecutor Adam Lally called Andre Porto and Ash Vallier, analysts at the State Police crime lab, to the stand. Here's how the day unfolded.