Now my thoughts; Every bullet has the potential of overpentrating, crap every thing a dept does could be "potential liability". ( recalled young lady killed with less-than lethal ammo a few weeks back .......)
Think about this for one second, most LEOs today that use the 10mm used the 10mm lite aka 40sw performance. So if most of the LEO agencies in the USA are using a 40sw caliber and most of the 10mms stills in services are using 40sw "like performance" ala "10mm-lite/FBI-lite/etc.... ) then they should be at no more risk of over penetrating.
The police force should worry more about markmanship and actually hitting a person vrs over penetration issues. You probably stand more of a chance of being hit by a miss than a overpenetrated projectile. ;f