"all merchandise on shelves higher than 12 feet above the sales floor of a working warehouse shall be secured. Methods of securing merchandise shall include rails, fencing, netting, security doors, gates, cables, or the binding of items on a pallet into one unit by shrink-wrapping, metal or plastic banding, or by tying items together with a cord."

subsections (c) and (e) of Section 3241, 

This information is provided free of charge by the Department of Industrial Relations from its web site at www.dir.ca.gov.

Courts recognize that merchants must place merchandise on shelves safely so it will not fall.

The merchant must take affirmative steps to prevent it from falling, including checking the shelves periodically to ensure that merchandise is in a safe position and using devices to stabilize it.

The law recognizes that stacking merchandise on high shelves creates an unwarranted risk, and it is reasonably foreseeable that doing this contributes to the risk of merchandise falling.

Several courts have held that stacking boxed merchandise on a shelf above customers' heads creates an unreasonable danger.