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RIU doesn't have to. Everything from tier 1 backbones to 'mom and pop' ISPs log all that information and they mostly cooperate willing(without a warrant) with LEOs.
This is a huge business. The US government has over 50 terabytes(admittedly) of information on US(intra, inbound or outbound) data traffic, and they're expanding that rapidly. I'm guessing the real figure is about 10-100x that.
The major problem is the data doesn't do anything without people. Computers aren't yet looking for criminals, that still requires people to dig through the massive amounts of data. And unless they have a reason to monitor your connections, you're likely not in their long-term databases. Most traffic data is purged every 2 weeks to a few months(a year tops). And is mostly used for cyber security, terrorism, etc... not some guy growing a couple plants in his basement.
But who's to say once they'd expanded their 'human filtering' or developed AI to do this for them... anyone breaking *any* law could be a target.
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