April 12, 2018 8:06 am How Fentanyl Is Changing SDPD Crime Lab Tactics NBC 7’s May Tjoa reports on the changing of tactics used by San Diego police to determine chemicals and illegal drugs found at crime scenes. US & World Videos 2:45 La Jolla Concours d'Elegance classic race cars 1:39 Troops Endure Hyper-Realistic Training 2:07 New study links consuming red meat with dementia 2:05 Police find, return dozens of abandoned Amazon packages 0:28 A Vermont state trooper plunges into icy pond to rescue 8-year-old girl