I bought a $45 Sunflex IR blocking license plate cover to test it. It's not looking great for the company behind it.
Master Tailgaters Small License Plate Frame Backup or Front Camera with 8 IR LED Night Vision, IP68 Waterproof, and 170 Wide Angle Camera
ILPT Hiding license plate from cameras with IR : r/IllegalLifeProTips
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America Rear Camera license plate Registration Plate Holder Parking Camera 8 Infrared LED alloy blind spot frame camera brake - AliExpress
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7 LED IR Infrared Waterproof Night Vision License Plate Frame
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2 units)PHANTOM PLATE (NOVELTY USE ONLY)License Plate Cover speed
SunflexZone.com's Infrared License Plate Blocker Demonstration.
imad NUMBER PLATE COVER WITH LIGHT REFLECTOR Bike, Car Number
License Plate Cover IR Invisible-Plate Infrared Cover Protector
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Small License Plate Frame Backup or Front 170° Camera with IR LED Night Vision