ov. Scott Walker wants to make Wisconsin the first state in the country to require childless adults applying for Medicaid to undergo drug screening, a move that could serve as a national model. Walker’s plan, which needs federal approval, comes as he prepares to run for a third term next year. Wisconsin’s Republican-controlled Legislature approved Walker’s request for a waiver to do the drug tests two years ago, but is now digging into the details of how it would actually work.