Something about TV series NCIS?

I have jst bin asked this question and i have no idea!! In NCIS, What was unique about the bullet that Ari Haswari used to kill Kate Todd, which led Gibbs to believe that the bullet itself was a message for him?
A7: It was coated in Teflon which makes it armour piercing and able to pass through two people at one time. I did see the episode and am a bit of a NCIS fan. I have finished the complete seasons 1-9 on NCIS DVD. Great TV series!

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