"It basically boiled down to just not having viable search areas at this point," Steve Lamar, Sierra's father said.The Sierra LaMar Search Center has been conducting weekly searches since the Morgan Hill teen went missing on March 16, 2012. Volunteers have put in more than 50,000 hours of time looking for her body. The 15-year-old was last seen on her way to a school bus stop. A new poster for Sierra LaMar will be introduced at the final search on Saturday. The poster, recommended by child advocate Marc Klaas and approved by the LaMar family, shows Sierra over a shot...