JEFFERSON CITY, Mo. (AP) — To receive Medicaid health coverage, some adults will soon have to show they are working, volunteering or taking classes. But to gather that proof, many states first will have to spend millions of dollars improving their computer systems. Across the nation, states face an immense task and high costs to prepare for the Jan. 1 kickoff of new Medicaid eligibility mandates affecting millions of lower-income adults in the government-funded health care program. The first...