You may not be sure, but the researchers that study this subject are sure - <a href="http:&#x2F;&#x2F;andrewleigh.org&#x2F;pdf&#x2F;GunBuyback_Panel.pdf" rel="nofollow">http:&#x2F;&#x2F;andrewleigh.org&#x2F;pdf&#x2F;GunBuyback_Panel.pdf</a><p>And for the US - <a href="http:&#x2F;&#x2F;www.slate.com&#x2F;articles&#x2F;news_and_politics&#x2F;crime&#x2F;2013&#x2F;12&#x2F;gun_ownership_causes_higher_suicide_rates_study_shows.html" rel="nofollow">http:&#x2F;&#x2F;www.slate.com&#x2F;articles&#x2F;news_and_politics&#x2F;crime&#x2F;2013&#x2F;1...</a>