no, I don't there's anything missing, other than the usual apathy toward systems reforms in most societies. this would probably work pretty well for these "uti

no, I don't there's anything missing, other than the usual apathy toward systems reforms in most societies. this would probably work pretty well for these "utility-like big gatekeeper corps" which handle a shitton of subpoena requests, of course it doesn't help if a SWAT team is executing a someone-shout-and-knock-with-that-huge-doorfucker-implement on the wrong house. in many countries there are state-managed online id systems allowing sending documents to legal persons ... which would make it really really trivial. send the warrant to the department executing it and to the department handling these at Verizon. (I wouldn't be surprised to learn that most of the US states already have something like this, but not used like this.) it can be optional/voluntary for natural persons, it can be mandatory for companies above some size, etc.