When these things come up people tend to venture into hyperbole. Probably because it's an incentives issue (it gets clicks and upvotes). If "preserving order" was the number everyone in the judiciary optimized for all of violent riots and protests against any cause you can imagine wouldn't have happened. But they did, so therefore this concept of "no evidence" is not true.
It's fine to be skeptical about private companies sharing "intelligence" (I would challenge the use of that word) with what are state-sanctioned entities (the police), and there's a long list of reasons to be skeptical. So obviously there is no reason to invent things that are not true.
They could arrest everyone and have perfect order. Short of that, they can only arrest people at the first small sign that person might ever not preserve order. Which is what they are currently doing. Things like loitering, expressing political opinions online, or being LGBT, are signs that a person might in the future not be completely orderly, and they arrest for that.
Ironically builtin smartphone calculators are really bad, and one of the best ones you can download might be Graph 89 (a TI-89 emulator).
Rant/Aside: Smartphones (or at least Android) are just generally really bad at being... smart, especially out of the box. No dictionary? No thesaurus? To say nothing of built-in encyclopedia (e.g. Wikipedia). Calculator worse than the $1 scientific ones? It's astounding how obvious it is that they're meant to dumb people down and just sell you crap when you look at the complete absence of basic functionality anyone from 50+ years ago might expect them to have.
>kids have smartphones, what's the point of a graphing calculator?
Many tests will not allow you to use a smartphone. My son couldn't even use the school issued chromebook on his PSAT, he had to get a loaner Windows laptop or use an approved hard calculator.
I'm with you. Some open source app is all they need.
However to answer your question: phone rules in classrooms vary enormously and the dedicated calculator is faster to interface when you're drilling problems in a homework setting
I finished highschool in the (gasp) 20th century so the modern classroom is certainly something I've had to learn
At least not the rockstars I had the pleasure of working with.
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