[Aaron_A]

So what if it is a silenced sniper rifle?

[LibWhacker]

The show I saw didn't mention silencers, but you'd think that would be one way to go to beat it. But remember, even silenced weapons make noise and this system is so sensitive it can (apparently) pick up the sounds the individual bullets make in flight to trace their paths.

[xm177e2]

So what if it is a silenced sniper rifle?

Suppressed ("silenced") rifles make very little noise at the barrel, but if the bullet is faster than the speed of sound, it still makes a noise (and according to this article, that is what is tracked).

Having a suppressor wouldn't help, unless terrorists were using subsonic ammunition. But subsonic rounds are really, really wimpy, and won't penetrate armor.

So the system would work very well against enemy snipers.

[Lazamataz]

So what if it is a silenced sniper rifle?

Then you will have a vastly less-effective sniper. Subsonic rounds are required for sound-suppressed fire and the benefit of a rifle is speeding a large bullet up to high (supersonic) velocitities that are capable of penetrating body armor, lightly armored vehicles, and maintaining a flat trajectory to a distant target.