NCIS: Los Angeles - Overwatch

What is so important about the body that is stolen from the morgue, that a staff member is even killed to get him?  A residue was found on the body before it was stolen with a US Navy identifier on it.  The team discover it is an experimental marker that was trialed in the Middle East to keep track of suspected terrorists via satellite.  Only trouble is, the deceased had never been to the Middle East.  They turn the satellite to Los Angeles and find there are a large number of targets, even though the Navy says they never trialled it on US soil.  It is then discovered that the majority of the marked people are Muslims.  Is there are terrorist threat or is there something else going on?  A great episode that comments on US home security and how Muslims are still being perceived.