Nevada legislators have intensified their focus on gun violence as the subject dominates national discussion after dozens of people were killed in December at a Connecticut elementary school.The Senate Committee on Health and Human Services heard from a panel of experts Thursday on the relationship between mental illness and gun violence. No bills or budgets were introduced; the intent was to broaden the senators’ understanding of the issue, said Sen. Justin Jones, D-Las Vegas and the committee’s chairman.There is no single approach to dealing with the issue, but rather a need for policy concerning the people, the guns and culture, …