No pre-need trust funds shall be mingled or commingled with the funds of any other person, firm, or corporation; except that, for the purpose of investment pursuant to Division 3, Chapter 12, Article 9 of the Business and Professions Code and the provisions of this Article, all preneed funeral trust funds received and held by a single trustee or a single set of trustees, may be commingled for investment purposes.

If the bureau finds that such funds have been invested in violation of this Article, it shall, by written order mailed to the person or persons in charge of such funds, require the reinvestment of such funds in conformity to this Article within ninety (90) days from the date of such order; provided, however, that such period may be extended by the bureau at its discretion.

In the enforcement of its order, the bureau is authorized to bring such action as may be necessary to enforce the provisions of law subject to its jurisdiction.