This letter from my doctor worked for me:
[Official Letterhead]
[DATE]
To Whom It May Concern:
[NAME] is currently being treated for the diagnosis [DIAGNOSIS]. His first appointment here was 9/22/09. He continues treatment at our outpatient clinic. He has never endorsed any aggressive or homicidal thoughts to me in his treatment sessions. I do not see any contraindication to his possession of a firearm.
Sincerely,
[signed]
[Doctor Name]
[Title]
[Official Letterhead]
[DATE]
To Whom It May Concern:
[NAME] is currently being treated for the diagnosis [DIAGNOSIS]. His first appointment here was 9/22/09. He continues treatment at our outpatient clinic. He has never endorsed any aggressive or homicidal thoughts to me in his treatment sessions. I do not see any contraindication to his possession of a firearm.
Sincerely,
[signed]
[Doctor Name]
[Title]