Mr. Mojo - don't worry, this is BS. There are .22s that will penetrate a lot of vests, and many rifles will penetrate a lot of vests. Besides, there are two types of this ammo: the civilian, which fragments very easily in order to help reduce "overpenetration;" and the LEO/military version which is available only on department letterhead. You won't be finding the latter version on the street in the wrong hands.
Believe me, I know ;)
Eventually EVERYTHING makes its way into the 'wrong hands.'
Plenty of corrupt cops out there.