[CapitalistCartr]

Seriously? Now I know everyone with whom you associate. I know everything you like to do. I know how fast you drive. Because you "associated" with several serious felons (you were in the same bar/diner/club as them several times), I can make a case for conspiracy. I have you in the same area as several serious crimes. Perhaps the data source (phone?) isn't exact all the time (it never is), so I have you as being at some places you weren't at. The scene of crimes? I know everyplace you've been for years, so forget running.

Have you been speeding in the past few years? A lot? Have you done anything private? Seen doctors/specialists about private medical issues? Have you had an abusive spouse or stalker in your life? I bet they'd love the data.

[imgabe]

Do you seriously believe that's how conspiracy cases work? "They were in the same restaurant several times, they must be involved in a criminal conspiracy". I guess every waiter, cook, hostess is also indicted for conspiracy as well, if that's all the evidence they need.

Google doesn't issue speeding tickets. If the government were to issue a ticket for every single instance of speeding and even 1% of them contested it, the system would be so clogged with paperwork that it would grind to a complete halt.

Personally, no I haven't been to the doctor. People go to doctors, though. That's not a big secret. Are you personally on the lookout for every single person who visits a doctor so you can...make fun of them, I guess? Do you imagine other people are?

An abusive spouse/stalker already knows where you live. If they're that motivated and want to find you, they'll wait outside your house. Hiding the information is not a solution to that problem, those people need to be arrested and incarcerated.

[gwern]

> Do you seriously believe that's how conspiracy cases work? "They were in the same restaurant several times, they must be involved in a criminal conspiracy". I guess every waiter, cook, hostess is also indicted for conspiracy as well, if that's all the evidence they need.

I think you need to read up on the 'domestic terrorism' cases in the USA and how NSA investigations actually proceed. One fun instance was Clapper giving presentations on a network of possible terrorists all linked together. The link was a pizza place.

[imgabe]

And 100% of the evidence was that they met at the same pizza place? There were no other indications? In that case does it flag every single group of high school friends who regularly get pizza after school, or every group of co-workers who hit up the same happy hour a couple times a week?

Sadly, that's not outside the realm of possibility, but that information alone is practically worthless in determining if someone is a terrorist. "Regularly meets with the same people in the same restaurant" describes almost the entire young, single adult population.

[gwern]

> And 100% of the evidence was that they met at the same pizza place? There were no other indications?

It was enough for the guys supposedly in charge of protecting us to waste a lot of time staring at graphs. And the 'threat matrix' is full of even more shit than that; I refer you to "Secret without Reason and Costly without Accomplishment: Questioning the National Security Agency’s Metadata Program", Mueller & Stewart 2014 http://politicalscience.osu.edu/faculty/jmueller/NSAshane3.p... for that and other sorry details of 'the war on terror'. Seeing the sausage made is never pretty.

> In that case does it flag every single group of high school friends who regularly get pizza after school, or every group of co-workers who hit up the same happy hour a couple times a week?

No, I'm sure some racial and religious profiling was part of the special top-secret sauce which selected that particular pizza joint...

[imgabe]

I agree that's a problem. I don't think the issue is that this database exists. I think the issue is that there are people conducting a witch hunt in the first place. If they are that bad at finding terrorists, they'll misuse whatever information is available to them. The solution is to not give people the power to conduct secret investigations and trials etc. in the first place.