The popularity of the 9 mm in Law Enforcement

I went 9mm a little over a year ago, and as an instructor for my dept I have influenced and push other officers in that direction as well. 

The 9mm's popularity is on the rise with US Law Enforcement and even the FBI has shown a renewed interest the it, which is funny considering their history. 

Despite all the debate, one thing is for sure with dealing with handgun stopping power; shot placement is key. Also, to go with that, penetration is also very important, which in general the 9mm has. 

My department doesn't officially regulate ammo beyond hollow-point, but I stress the following to my guys: 

1. +P, the added pressure adds to the round's overall velocity and penetration,

2. Hollow point, among other things, helps prevent over penetration, 

3. Bonded, consistent performance and weight retention, particularly beneficial when dealing with obstacles like vehicle glass and heavy clothing. 

I have been carrying Winchester's PDX1 do to availability in my area and the fact that it meets the 3 basic criteria I look for. I also like the 124 grain weight of the round better than the heavier 147 gr or lighter 115 gr that is common in the caliber. 

In my opinion, the advantage of higher capacity, low recoil, cheaper ammo cost, and modern bullet design, among other attributes will continue to fuel the rounds popularity.