By Dan McKay / Journal Staff Writer   Sen. Nancy Rodriguez, D-Santa Fe, looks through exhibits Wednesday during a meeting of the Legislative Finance Committee in Chama. As the meeting continued Thursday, lawmakers heard presentations on child abuse and efforts to help families. (Eddie Moore/Albuquerque Journal) SANTA FE — Far fewer children in New Mexico's child protection system receive services intended to prevent maltreatment from their families than the national average — a reflection of the opportunity, legislative analysts say, to focus more on preventing abuse. About five of every 1,000 children in the state system are part of families...