Many of us want to have stuff that is authentic as possible, but you have to know how the whole LEOs in the fictional media costuming thing works.

Most cop shows will have a certain amount of non-authenticity to protect the production from possible legal problems regarding federal law. Some famous examples are:
CSI- the division portrayed in the TV series as part of LVPD (Las Vegas Police Department) is actually a division of the Las Vegas Metropolitan Police Department (LVMPD)
X-Files- The ID cards carried by Mulder and Scully (and Reyes and Doggett and assistant principal Skinner) all say "Department of Investigation, Federal Bureau of Justice" instead of the real Federal Bureau of Investigation, which is the LEO arm of the Department of Justice
The LAPD almost NEVER allows likenesses of its shield or uniforms to be used in films or TV. In "T.J. Hooker", all of us living in LA, as well as everyone else, knew that the "LCPD" in the series was really LAPD. The LAPD was portrayed in the film "Blue Thunder", and the patches and uniforms were correct, but the shields were bogus. Same goes for FXs "The Shield", which uses shields very similar to LAPD, and makes veiled reference to being LAPD, but never does so explicitly, because LAPD would have their collective ass.

There are, however, a lot of real, authentic wearables that we civilians can score, with no fear of reprisal. I have personally purchased patches from LAPD, and there are some great sites where you can get shirts and patches that are bona fide NYPD and FDNY.
As far as NCIS goes, I am compiling sources for real-life NCIS, as well as TV-authentic NCIS stuff, for you wannabe McGeeks. I will classify each as either authentic to the series, or authentic to the real NCIS. My sources are NCIS's official web site, and a new TV series on Investigation Discovery, 10PM EST Thursdays, called "The Real NCIS".

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