TO: Chief of Police, City of Dallas, Texas. Signature of Registered Owner.C Letter of Authorization. B Proper Signatures. You must complete all the fields on this form. Secure proper authorization to sign documents on behalf of your company with our expert tips and free . Affidavit of Motor Vehicle Gift Transfer. The authorization letter must clearly define the scope of authority granted. Instructions: Complete all applicable sections to have information disclosed from UT Southwestern Medical Center to another provider or. ☐ An acceptable form of signature authority is required if applying on behalf of an entity or using a power of attorney.