https://www.mprnews.org/story/2019/02/07/google-location-pol...
If there's an obfuscation of the actual investigation here, I'd guess it's more a hiding of highly automated tools that process open source intelligence, probably by policy of the federal agency with the tool. Imagine a FBI/DEA/NSA tool that links and summarizes social media activity based on identities. So facial recognition + cell database -> trail of pictures to craft a link-narrative, without the work of having to dig much or do automated facial recognition. Tangentially I wouldn't be surprised if declaring "antifa" a "terrorist" organization is actually an internal dog whistle that blesses the use of XKEYSCORE etc against American citizens.