OSHA's proposed silica dust rules are getting their day in court, so to speak, as public hearings are underway in Washington D.C. A long list of industry representatives are testifying, including Pat O'Brien (Concrete Sawing & Drilling Association) and Bob Garbini (National Ready Mixed Concrete Association)--click here to see the full schedule of hearing participants. CC has been covering this issue and at the World of Concrete sponsored a discussion between O'Brien and Jim Rogers, head of OSHA's Western Education Center. To see a video of that discussion, click here.