It depends on where you are located and how LEOs respond to jammers.
In most areas, as long as you use them correctly and JTK, you won't run into any problems.
Where parking-only modes are useful is if you get pulled over (even if not for jamming) and they notice the sensors and inquire about them. "They're parking sensors, Officer."
In some parts of Virginia, LEOs are aware of jammers and will shoot a car that they see heads on even if they're not speeding, or stopped in traffic, to see if they are jamming, and they get pulled over and ticketed if they are. Switching to parking-only or detect-only mode prevents this.
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