Okla. Stat. tit. 40, § 40-174: Scaffolding, etc., to be safeguarded

All scaffolds, hoists, cranes, stays, ladders, supports, or

other mechanical contrivances erected or constructed by any person,

firm or corporation in the state, for use in the erection,

repairing, alteration, removal, or painting of any house, building,

bridge, viaduct, steel tank, standpipe, or other structure, shall be

erected and constructed in a safe, suitable, and proper manner, and

shall be so erected and constructed, placed and operated as to give

proper and adequate protection to life and limb of any person or

persons employed or engaged thereon, or passing under or by the

same, and in such manner as to prevent the falling of any material

that may be used or deposited thereon. Scaffolding or staging swung

or suspended from an overhead support more than twenty (20) feet

from the ground or floor, shall have, where practicable, a safety

rail properly secured and braced, rising at least thirty-four (34)

inches above the floor or main portion of such scaffolding or

staging and extending along the entire length of the outside and

ends thereto and such scaffolding or staging shall be so fastened as

to prevent the same from swaying from the building or structure.