Follow-up with the source by:
               
                  - 
                     
                        • 
                           mailing a letter to the source, 
 
 
- 
                     
                        • 
                           faxing a letter to the source, 
 
 
- 
                     
                        • 
                           calling and speaking to the source by telephone, or 
 
 
- 
                     
                        • 
                           calling the source by telephone and leaving a clear and detailed message on the source's
                              voicemail.
                            
 
 
Any of these contacts constitute a successful follow-up attempt with the source. For
                  more instructions on how to request and document receipt of evidence by telephone
                  or fax, see DI 22505.030.