(a) One or more persons may be authorized to exercise the power of sale under a security instrument.
(b) A trustee may not be:
(1) assigned a duty under a security instrument other than to exercise the power of sale in accordance with the terms of the security instrument; or
(2) held to the obligations of a fiduciary of the mortgagor or mortgagee.
Official text of the Texas Property Code as published by the Texas Legislative Council.