To me this is OK. Specific crimes, specific limited locations, filter for the repeating phones and and then get a warrant on them and no longer use the general

To me this is OK. Specific crimes, specific limited locations, filter for the repeating phones and and then get a warrant on them and no longer use the general ones. The thought that goes into targeting is important and I hope subscriber information was only looked up on those that did match multiple crime locations. On the the other hand the NSA/GCHQ etc. scoop everything and that is not OK and is too easy to abuse. Edit: I do think that the phone companies should have the maximum retention period limited by law rather than the minimum. It would also be better if the full tower warrants only provided unique references (hashes?) rather than phone numbers themselves until the follow up specific requests.