The evidence
Does it actually work?
Before spending public money on surveillance, it's fair to ask a simple question: does it reduce crime? Here's what the independent research says — studies not funded by the companies selling the technology. Every finding links to its source.
What the studies find
Project Green Light cameras
No measurable effect on violent crimeThe U.S. Department of Justice's research arm (CrimeSolutions) rated Detroit's own camera program “Ineffective” — “no statistically significant impact on reported violent crime compared with the control group.”
Source · DOJ / National Institute of Justice ↗Security cameras (CCTV), broadly
Helps with car & property crime — not violenceA systematic review of 76 studies found about a 13% reduction, concentrated in parking lots and vehicle crime. “No significant effects were observed for violent crime or disorder.”
Source · Piza, Welsh, Farrington & Thomas (2019) ↗License-plate readers (Flock)
Recovers stolen cars; no proven crime reductionA quasi-randomized study found plate-reader patrols increased stolen-vehicle recovery but showed “no evidence of a crime reduction effect.” Flock's own “solves 10% of crime” figure comes from a Flock-funded study a participating researcher called too incomplete for meaningful analysis.
Source · Koper et al. (2022); Techdirt ↗Gunshot detection (ShotSpotter)
No reduction in shootings; few alerts find a crimeA federally funded evaluation found it “did not reduce the occurrence of fatal shootings, nonfatal shootings or other violent felonies.” Chicago's Inspector General found fewer than 1 in 10 alerts produced evidence of a gun crime.
Source · NIJ (Piza); Chicago OIG ↗Police drones (DFR)
No independent crime-reduction study existsThere is no independent evaluation showing drone-as-first-responder programs reduce crime. Civil-liberties researchers note agencies “tend to trumpet their successes and bury their failures,” and that the idea “needs to be meaningfully evaluated by independent researchers.”
Source · ACLU; EFF ↗None of this means the tools are worthless — plate readers recover stolen cars; cameras help with property crime. It means the case for big public spending on them, especially for reducing violence, is far weaker than the marketing suggests.
Detroit wouldn't be first
Cities that looked at the evidence and pulled back
City watchdog found fewer than 1 in 10 alerts showed evidence of a gun crime.
Police couldn't confirm a shooting for 91% of alerts.
An audit found 20%+ of searches lacked documentation; concerns over ICE access.
Acted after the wrongful arrest of Detroiter Robert Williams.
Privacy, free expression, and documented racial inaccuracy.
What the record actually shows
We looked hard for corruption — no-bid contracts, kickbacks, vendor money flowing to officials. The honest answer: we found no documented financial scandal in Detroit's surveillance contracts. The single vendor-to-official donation on record is a $1,000 gift to a 2013 mayoral campaign. We won't imply more than the evidence supports.
The real, documented problem is about process and results. In October 2025, the Michigan Court of Appeals ruled that Detroit violated its own surveillance-oversight ordinance — the city failed to post the required public review 14 days before approving ShotSpotter contracts. The court called procedural safeguards something that “cannot be ignored or downplayed by government actors as mere technicalities.” (The contracts weren't struck down; a remedy was sent back to the lower court.)
Put those together and a clear, fair case emerges: the technology's crime-reduction benefits are weak or unproven, the most flattering numbers come from the companies selling it, and the public process has already been found wanting once. That's reason enough to slow down and get it right.
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