Here's what a Navy prosecutor/defender said NIS (NCIS) which relates to your Lesson #3: NCIS Reports are a one-sided story
From USNews.com, link http://www.usnews.com/usnews/culture/articles/921109/archive_018611_5.htm
...."NIS targets from admirals to seamen complain that agents often make up their minds in advance about a person's guilt or innocence, then build a case to support their theories. "What they do," says Dan Hyatt, a decorated Navy enlisted man who rejoined the service in 1981 as a prosecutor and a defender, "is they interview 15 people. And if the potential witnesses have something favorable to say, they won't reduce it to a sworn statement; they will just produce a memo that the person has nothing to offer. So you end up with a pile of evidence on a guy that does not have anything favorable in it, and people are accused where they should never be accused in the first place.""....
The NCIS has been criticised so harshly that I'm amazed reforming it has never gained traction. I'm sure the NCIS performs many useful tasks as the Navy and Marine Corps HR Dept./police force. But these guys do not belong in combat zones.
Regarding your earlier post, no, the NCIS never claimed that Pantano confessed. But apparently, they did claim he changed his story (not true) and was arrogant (where have we heard that lately?)