Always.
It took me quite a long time to be comfortable with doing so though. I've been cc'ing for over two years now without an unintended discharge. I think what gave me the most confidence was constantly drilling into my head to "keep your finger off the trigger". I carry a Glock 26 and my trigger finger now instinctively finds the slide breakdown lever every time I handle it. This along with never handling the gun without taking a second or two to focus on what I'm doing before doing so. After all its not another cell phone
Sent from my iPad using Tapatalk HD