On 03/19/15 , 03/26/15 , and 04/02/15 , 61 potential research study participants were sent letters with incorrect addresses on three different occasions . Two participants contacted the facility to say that they received letters that included their address , but another person 's name instead of theirs . Because the contact database contained information from Veterans who participated in research years ago , staff assumed that this meant that the addresses in that contact database were no longer valid . However , on the morning of 04/13/15 , the primary investigator ( PI ) , regulatory coordinator , and study coordinator reviewed the problem . They cross checked the contact database with the mail out recipient list and discovered that the list had been sorted incorrectly , which resulted in up to 61 instances of Veteran A receiving Veteran B 's recruitment letter . The recruitment letter(s ) indicate that the study being recruited for is a " PTSD and Smoking Cessation " study . ;