Many LEOs are required to keep one in the tube and also to not have a safety - if you need it, squeezing the trigger should make it speak. I have a couple carry pieces that have no safety and one stays in the tube. The trigger/hammer remain under minimal pressure, even when cocked, until you start to squeeze (fairly long throw) which puts more pressure until the hammer cycles all the way back and releases. While not impossible to accidentally discharge, you have to be pretty reckless for it to occur.
Thanks for the info.