Holsters for carrying concealed - for civilian and off-duty cops (unless dictated by policy) - should serve one main purpose: keep the trigger guard covered. The holster should offer enough passive retention that your gun won't fall out if you reach down to tie a shoe. That said, its not a bad idea to learn to protect your gun from being taken away and carry a nice CQB blade on support side if attacked on strong side and can't get to your pistol.