225 ILCS 705/6.09

When working places are discovered in which there are recent falls, dangerous roof, accumulation of gas or other dangerous conditions, he shall place, in all entrance ways to said working places where dangerous conditions exist, conspicuous marks or signs to "keep out". Should he find that the provisions of Section 24.03, with reference to distance rock dusting is back from the face, are not complied with, he shall record such condition, and the place, in his daily examination report.