Live data from Hacker News

ShotSpotter: listening in on the neighborhood

computer.rip

341–350 of 443 posts

Re: ShotSpotter: listening in on the neighborhood

#341
post #177
post #74

Earlier quoted context omitted.

The problem is Bayesian priors look an awful lot like racism to the unaided eye, enough so that it's really hard to justify them. Or maybe it's racism masquerading as a Bayesian prior. I don't see how to know for sure either way.

Also if such devices (and law enforcement) worked well to reduce crime, the crime would move to less-surveilled areas. We don't see that happening anywhere.

Violent crime is not a zero-sum game.

Re: ShotSpotter: listening in on the neighborhood

#342
post #316

Earlier quoted context omitted.

The “data” which gets presented in court is the classification. So they changed the “data”. The underlying algorithm wasnt subject to examination by defense teams until a rules change like, last week.

What gets presented in court is a "Detailed Forensic Report" that includes the timestamped audio waveforms, sensor locations, and screenshots of the multilateration computations. These reports, when used as evidence, are required to be available to the defense for rebuttal and crossexamination. One could, if one was so inclined, calculate shot locations by hand from these reports. The time stamped audio files are dis…

https://www.theverge.com/2024/2/15/24074214/justice-in-foren...

Re: ShotSpotter: listening in on the neighborhood

#343
post #337
post #329

Earlier quoted context omitted.

That's what I get from faulty memory. However, evidence is still being used even when it's not directly brought up in court. "In the 2015 Massachusetts case, the court refused to allow the introduction of ShotSpotter audio after the defendant argued the audio was captured and obtained in violation of that state’s wiretap laws. Police in that case requested and received an extended audio clip from the company that cap…

edit: Good point, I agree that parallel construction is an important concern, especially since there's so little transparency in police investigations. One possible solution is to force them to limit the duration recorded to only a few seconds. (I previously thought that's how ShotSpotter worked. Turns out they've kept days of audio before, apparently for "debugging purposes.") > Drug crime is known to be fairly even…

Audio evidence is being used such as in the Massachusetts case.

PS: You are quoting my previous post not an edit: "Drug crime is known to be fairly evenly distributed across different incomes, arrests are extremely biased." is from further up the thread.

Re: ShotSpotter: listening in on the neighborhood

#344
post #308

Earlier quoted context omitted.

The frustrating problem with people down voting without any explanation is that simply ignoring the knowledge of experts and hiding whatever has emotionally enraged you does not further the discussion.

I think people don't "trust the experts" when they read the "experts" saying things like this: > The reader can probably infer how this coverage pattern relates to race and class in Albuquerque. It's not perfect, but the distance from your house to a ShotSpotter sensor correlates fairly well with your household income. The wealthier you are, the less surveilled you are. This sets off the bs alarms to me. The author k…

Sounds like you are grossly distorting the author's rationale, and playing dumb. What's your agenda?

Re: ShotSpotter: listening in on the neighborhood

#345

Earlier quoted context omitted.

The most costly form of theft — by far — is not burglary or robbery but wage theft. That is a crime overwhelmingly committed by rich professionals and rarely enforced. So if we really want to get serious about stopping theft, we should allocate much more resources to investigating businesses than putting beat cops on the street. There’s not actually a well known link between poverty and crime in the way you imply. We…

Ah, so this is what you were so keen to steer the conversation to. Alas, despite the name, wage theft is not considered a criminal act (misdemeanor/felony) in most US states, so enforcement is left to the Department of Labor and the IRS, not police. Now I'd agree with you that society should be putting more resources into combating this, but I'm still going to ask you to respond to my earlier question: for the hypoth…

I’m not really steering the conversation anywhere. Wage theft is a felony in many states. Which is the point I’m making: crime is socially constructed, and two big reasons that some areas are “low crime” and some are “high crime” is that we’ve decided to A) selectively criminalize things and B) selectively enforce those laws.

As to your question: if you are playing SimCity and you have a little number in your omniscient UI that reads “crime rate” and police are your one lever to address that, by all means add more police to the area. But in the real world that’s not how things work.

Re: ShotSpotter: listening in on the neighborhood

#346
post #308

Earlier quoted context omitted.

I think people don't "trust the experts" when they read the "experts" saying things like this: > The reader can probably infer how this coverage pattern relates to race and class in Albuquerque. It's not perfect, but the distance from your house to a ShotSpotter sensor correlates fairly well with your household income. The wealthier you are, the less surveilled you are. This sets off the bs alarms to me. The author k…

Are you saying the quoted passage is a lie?

There's two explanations:

1. Cops use enforcement on poor neighborhoods because they like to make their lives difficult and because they hate poor people

2. Cops use enforcement there because that's where the crimes take place

Explanation 2 is so obviously much more likely that I can't take the person that purports reason #1 without acknowledging the other explanation. They're playing dumb.

Re: ShotSpotter: listening in on the neighborhood

#347
post #308

Earlier quoted context omitted.

I think people don't "trust the experts" when they read the "experts" saying things like this: > The reader can probably infer how this coverage pattern relates to race and class in Albuquerque. It's not perfect, but the distance from your house to a ShotSpotter sensor correlates fairly well with your household income. The wealthier you are, the less surveilled you are. This sets off the bs alarms to me. The author k…

Sounds like you are grossly distorting the author's rationale, and playing dumb. What's your agenda?

I'm distorting the author by quoting his article?

Re: ShotSpotter: listening in on the neighborhood

#348
post #308

Earlier quoted context omitted.

The frustrating problem with people down voting without any explanation is that simply ignoring the knowledge of experts and hiding whatever has emotionally enraged you does not further the discussion.

I think people don't "trust the experts" when they read the "experts" saying things like this: > The reader can probably infer how this coverage pattern relates to race and class in Albuquerque. It's not perfect, but the distance from your house to a ShotSpotter sensor correlates fairly well with your household income. The wealthier you are, the less surveilled you are. This sets off the bs alarms to me. The author k…

Ah. Not what I expected. And that's really why it ought to be necessary to leave a comment in order to make a downvote.

I assumed someone was raising a technical objection to my claim that acoustic location of transient sounds is "hard" - myself being the "expert" having published on firearm signatures and machine listening.

But this is about the socio-politics in TFA. Okay.

Re: ShotSpotter: listening in on the neighborhood

#349
post #316

Earlier quoted context omitted.

What gets presented in court is a "Detailed Forensic Report" that includes the timestamped audio waveforms, sensor locations, and screenshots of the multilateration computations. These reports, when used as evidence, are required to be available to the defense for rebuttal and crossexamination. One could, if one was so inclined, calculate shot locations by hand from these reports. The time stamped audio files are dis…

https://www.theverge.com/2024/2/15/24074214/justice-in-foren...

A proposed law, not a rule change. One introduced in response to a novel DNA analysis technique being rejected in a Frye challenge under existing law.

Re: ShotSpotter: listening in on the neighborhood

#350
post #330
post #226

Earlier quoted context omitted.

If you're going to be sarcastic, you should to make a point that makes sense. Criminals react to successful surveillance and law enforcement. It's idiotic to suggest that they wouldn't.

You are still claiming that crime is conserved. It's not possible, even likely, that a reduced cost-benefit for committing crime shifts preferences toward some non-criminal activity with a more attractive risk-reward profile?

Conservation of crime isn't a claim I made and it isn't relevant to my comment.

If ShotSpotter were successful, crime would move to a different area and/or go down. Arrests would be made, so it's impossible to assume crime rates wouldn't change in that scenario.

Neither happening in correlation with ShotSpotter installation, which is one way we know these tactics don't actually work.

Post reply on HN