we are still on our guard but we're satisfied yesterday's results are thorough but as police officer, you understand, we have a murdered police officer, we're not taking chances or making assumptions. >> reporter: chief, i was just at the crime scene. while there a law enforcement officer came by and said they're reinstituting the crime scene and this we had to leave the area. do you know anything about that and why? >> we're just doing now -- it's called a secondary review of the crime scene itself. it's nothing more than that. yesterday we were fight iing lighting conditions and some conditions were poor at the end of the day. that's showing you the attention to detail that the evidence technician technicians are giving to this, going out and reexamining. you have to imagine this is a very -- area that has a lot of