California Code, Labor Code - LAB § 7156

(a) Knowingly or negligently furnishes or erects, or causes to be furnished or erected for the performance of that labor, unsafe or improper scaffolding, slings, hammers, blocks, pulleys, stays, braces, ladders, irons, ropes, or other mechanical contrivances.

(b) Hinders or obstructs any officer or inspector of the Division ofOccupational Safety and Health attempting to inspect such equipment under the provisions of this article or any law or safety order of this state.

(c) Destroys or defaces, or removes any notice posted thereon by any division officer or inspector, or permits the use thereof, after the equipment has been declared unsafe bythe officer or inspector.