Still a bad idea
Computing devices, mobile or otherwise, should be under the control of their owners; not the manufacturers, not the mobile carriers or ISPs, not the OS vendors, and certainly not the police. And as I noted the last time this subject came up, this is a needless barrier to entry at a time when we're suffereing from a lack of competition. Laws like this one will only make the problem worse.
The consumer would be better served by giving him the ability to disable his own phone, if he wants to pay for the capability (and if it's popular, it will become commonplace). Middlemen should have nothing to do with it, except as the agents of the customers.