A child access prevention law (often abbreviated CAP law) makes it illegal for an adult to keep a gun in a place and manner so that a child can easily access and fire it. Proponents of these laws, such as the Law Center to Prevent Gun Violence, argue that they are effective at reducing accidental gun deaths among children.
The National Rifle Association has lobbied against such laws, arguing that they are ineffective and infringe on the rights of gun owners to protect their homes BARF.
A 1997 {albeit dated} study found that CAP laws were associated with a 23% decrease in accidental shooting deaths among children younger than 15 years old.
A 2000 study found that Florida's CAP law appeared to have "significantly reduced unintentional firearm deaths to children," but that the similar laws that existed in 14 other states did not seem to have such an effect. At the time, only three states in the U.S., including Florida, allowed those who violated their state's CAP law to be prosecuted on felony charges.
A 2004 study found that CAP laws were associated with a "modest reduction in suicide rates among youth aged 14 to 17 years."
A 2006 study found that states with CAP laws experienced faster declines in accidental child firearm deaths than states without such laws.
A 2015 study found that these laws have no significant impact on unintentional gun deaths, but that states with such laws had lower rates of youth suicide. Some studies have also found that CAP laws are associated with lower rates of nonfatal gun injuries among children under the age of 18.
In contrast, a 2016 study found that these laws were ineffective.
CAP laws, along with other strict firearm laws, are also associated with lower rates of unsafe gun storage among parents of preschool-age children. These laws are not always applied whenever they could be, and sometimes minors are charged instead https://en.wikipedia.org/wiki/Child_access_prevention_law
List of states with or without CAP laws (surprisingly, new york does not):
Child Access Prevention Law - SafeStorage or GunLock Req - AssaultWpns Ban
United States
28 Yes 11 Yes 8 Yes
Alabama No No No
Alaska No No No
Arizona No No No
Arkansas No No No
California Yes Yes Yes
Colorado Yes No No
Connecticut Yes Yes Yes
Delaware Yes No No
D.C. .... Yes No Yes
Florida Yes No No
Georgia Yes No No
Hawaii Yes No Yes1
Idaho No No No
Illinois Yes Yes No
Indiana Yes No No
Iowa ...... Yes No No
Kansas No No No
Kentucky Yes No No
Louisiana No No No
Maine.... No No No
Maryland Yes Yes Yes
Massa Yes Yes Yes
Michigan No Yes No
Minnesota Yes No No2
Mississippi Yes No No
Missouri Yes No No
Montana No No No
Nebraska No No No
Nevada Yes No No
N Hamp Yes No No
N Jersey Yes Yes Yes
N Mexico No No No
N York No Yes Yes
N Carolina Yes No No
N Dakota No No No
Ohio ... No Yes No
Oklahoma Yes No No
Oregon No No No
Pennsy No Yes No
R Island Yes Yes No
S Carolina No No No
S Dakota No No No
Tennessee Yes No No
Texas ........ Yes No No
Utah .........Yes No No
V
ermont No No No
Virginia Yes No No2
Washington No No No
W Virginia No No No
Wisconsin Yes No No
Wyoming No No No
http://kff.org/other/state-indicator/firearms-and-children-legislation/