With the passage of I-1639, voters have made Washington's gun laws among the strictest in the nation. In part, it raises the legal age to buy a semi-automatic rifle to 21 and requires safe storage of firearms.

One recent study led by the Harborview Injury Prevention and Research Center found that safe storage of guns would reduce suicides and accidental injuries among youth by about 75 percent, said Fred Rivara, a nationally known gun-violence investigator and a professor of pediatrics at the University of Washington School of Medicine.

"As a pediatrician, I don’t want to see more 8- and 10-year-old boys coming in, having been shot, because they and their friend found dad’s handgun and played with it," Rivara says.

Hear more from him in the video below.