The latest testimony in the Kelvin Vickers trial is focusing on forensics.
Several officers testified about what they found at a vacant house where Vickers was arrested, shortly after the shooting that killed Officer Tony Mazurkiewicz.
One officer says a 27-round magazine found in a bathroom had only one round left in it -- and a gun also found in that bathroom had Vickers's DNA on it.
But Defense attorney Michael Schiano says the DNA evidence is shaky.
Another officer found sneakers and other clothing belonging to Vickers in a crawl space.
Vickers is charged in Mazurkiewicz's homicide in July of last year -- as well as two others the night before.
Prosecutors say they may rest their case by the end of the week.