My husband is in the industry. If you want evidence...get yourself arrested and start playing up,...you'll soon get your evidence ROFL!!! Or just ask a crim - pretty simple! How else do you think police keep themselves and other safe, do you think they pull out weapons every five minutes?? They don't. They have pain compliance techniques they use.
ETA - I told you what they use tasers for in american...we're not discussing other issues other than tasering being used as example of getting someone to comply. Somebody said it is to restrain...and i'm telling you that it is to restrain but ALSO for compliance. If it's now not suiting your argument (which it clearly isn't) find another argument. I'm sure there is stacks of research suggesting that smacking children causes life long issues so start pulling them out so we can discuss it.