The problem is that to do that kind of queries, if you don't know beforehand what information you are looking for, then you need to store everything.
A comparison can be made to EU data retention laws which stipulate that carriers should keep call records for 6 months (or somehting like that. That is how the directive is implemented here, in Sweden).
> The problem is that to do that kind of queries, if you don't know beforehand what information you are looking for, then you need to store everything.
It's worth reading up on the history of the 4th Amendment in order to realize that isn't very far from the specific situation it was intended to prevent, namely "general warrants" allowing police to search whatever homes they wanted in an investigation.
A comparison can be made to EU data retention laws which stipulate that carriers should keep call records for 6 months (or somehting like that. That is how the directive is implemented here, in Sweden).