14-10810. Record keeping and identification of trust property A. A trustee shall keep adequate records of the administration of the trust. B. A trustee shall keep trust property separate from the trustee's own property. C. Except as otherwise provided in subsection D, a trustee shall cause the trust property to be designated so that the interest of the trust, to the extent feasible, appears in records maintained by a party other than a trustee or beneficiary. D. If the trustee maintains records clearly indicating the respective interests, a trustee may invest as a whole the property of two or more separate trusts.
Arizona Legal Code