I know personally with the security company i work for we are trained / licenced to carry OC spray, baton, handcuffs. We had to go through cerification and testing for all of them, and are issued based on the location you'll be working at. For example at a low risk site we may just use open hand techniques and de-escalation as much as possible, to a high risk site using handcuffs, baton, and OC spray while wearing Level 3a vests.
There is an incredible amount of liability involved if you are not licenced, and most of the training we received always came back to the point of what is court defensible, and what is not. Even though we are licenced to carry, especially the baton, if we are pulled over by the police we are guaranteed to have some very serious explaining to do, and generally will actually contact the local police force and advise them of any equipment we may be transporting. My understanding of it was that if you are caught carrying it, even in a standard carrier it can still be easily considered carrying a deadly weapon.
I have personally had to use my baton in a few situations, but it is always an absolute last resort, where all else has failed, i have hopefully been able to contact the local police and help is on the way. The few times i did use it, there was a great deal of explaining that had to be done in court, as a single strike, properly applied will generally break bone. It may be a cool piece of kit to have initially, but like anything, must be treated with a great deal of respect.