Another study, published the same year, found that states with permit to purchase, registration, and/or license laws for handguns had lower overall suicide rates, as well as lower firearm suicide rates.[47] A 2014 study found that states that required licensing and inspections of gun dealers tended to have lower rates of gun homicides.[48] Another study published the same year, analyzing panel data from all 50 states, found that stricter gun laws may modestly reduce gun deaths.[49] A 2016 study found that U.S. military veterans tend to commit suicide with guns more often than the general population, thereby possibly increasing state suicide rates, and that "the tendency for veterans to live in states without handgun legislation may exacerbate this phenomenon."[50] California has exceptionally strict gun sales laws, and a 2015 study found that it also had the oldest guns recovered in crimes of any states in the U.S. The same study concluded that "These findings suggest that more restrictive gun sales laws and gun dealer regulations do make it more difficult for criminals to acquire new guns first purchased at retail outlets."[51]