State lawmakers are once again discussing a proposed bill that would undermine local regulation of frac sand mining. On February 26, Senator Tiffany and Representative Ballweg introduced Senate Bill 632 and Assembly Bill 816, which would restrict local governments from applying new regulations to existing frac sand operations. Legislators have moved quickly, holding a joint committee meeting days later to gather testimony on the bill. Concerned citizens and others had less than a week to study the bill and raise questions, but dozens still appeared in Madison for a contentious committee hearing on Monday, March 3 (see reports on the hearing by Isthmus and Wisconsin Watch). The committee held a vote on Wednesday, March 5, approving the bill and passing it on to the full senate.