AMSTERDAM, Mo. -- Another search is under way in the case of David Cook, who has been missing from his Bates County home since November.Cook, 55, disappeared from his farm near Amsterdam, Mo. Only his wallet and glasses were found in his home.This week, the company Texas Equusearch began scouring the farm. They specialize in searching for missing people. The company is volunteering its services.Several months ago, Cook's family asked Texas Equusearch to get involved in the case.The search will continue over the weekend.