TO: Chief of Police, City of Dallas, Texas. The sole purpose of this form is to authorize the above named representative to complete the transaction indicated.The documents and forms below may be required in addition to your application in order for your application to be complete. This Authorization Letter sample is available for use on UpCounsel. Please fill out the attached authorization form completely and submit via fax or mail to: Dallas Sarcoma Associates. O Sample Letter of Authorization. Numerous other forms are available upon request from the appraisal district.