Collecting insignia from the Federal Bureau of Investigation since 1999.
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The FBI Evidence Response Teams are comprised of a group of highly-trained and well-equipped FBI personnel who specialize in organizing and conducting major evidence recovery operations. They manage the identification, collection, and preservation of evidence at crime scenes.  Each Field Office has its own ERT which can be called upon to respond worldwide to incidents deemed of an investigative nature by FBIHQ.  Some of these divisions also have their own ERT patches.

Source:  The Virtual Reference Desk