Additionally, all around MSFT campuses in the old days there'd be cops waiting to catch exiting employees going 36 in a 30 (exactly 5+ over) at the end of the month to fill their quota.
There used to be a host of lawyers on the Eastside who specialized in getting rid of traffic tickets for MSFT employees on technicalities. It was cheaper than having your insurance jacked up.
I got a traffic ticket every 6 months or so in WA (all of them for 6 miles above in a residential, because I drove like an old man even when I was young). Since moving to CA, in almost two decades I've gotten exactly one for rolling a stop sign. My driving habits haven't changed.
All that to say traffic enforcement is a relied-upon income stream for some places in the US.
Throw in waze and you're in a situation where you can basically cruise at 90 for a long distance vs. 75. Escort or V1
For these kinds of stops, where they were waiting on side roads for you drive by, a radar detector might not even help much ?
I did have friends with detectors for highway driving, so your suggestion is solid. I wish cars had them as options like leather seats :-)