Yes. I worked for a city and was tasked with occasionally reading emails that had been reported. I got to read some interesting ones, but the one I’m talking about: The auto-theft detective was informing patrol officers about the setting up of the device I described. It would send an email when a vehicle’s license plate was scanned and was returned with a STOLEN result. The majority of the email was about how the officers should not mention the device and only say that they had received a tip about a stolen vehicle.

We aren’t talking about the permanent sorts of signs, like those described by @reversalhatchery@beehaw.org