Handcuff keys are not restriced for sale by law, however, if some unsavoury person got hold of one, and on a busy Saturday night in a scuffle released a mate who had been arrested, a police officer could get injured. If that happened we would have assisted that person by supplying the key.
Only authorised persons should need a handcuff key, which is why we will ask for authorisation information if you buy them from us. Anything that tells us what we need to know will do, an e-mail from your work e-mail address will be fine, or we can send the key to your place of work. Some people don't seem to understand the implications of selling handcuff keys to just anyone, it is just a 'common sense' thing really. If you can get them on eBay and no checks are done, who are they selling them to? I guess there are some people who use handcuffs in the bedroom !!! That's another story, they won't get a key from us.