Okla. Stat. tit. 13, § 201

No common carrier authorized to do business in this state, when requiring of an employee a bond or undertaking of any nature whatever, shall require such employee to have such bond or undertaking executed as surety by any particular person, company, corporation, association, or firm, or by any one or more of any number of such persons, companies, corporations, associations or firms named by such common carrier; and no such common carrier shall reject any such bond or undertaking for any reason other than the financial insufficiency of such bond or undertaking.