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What makes her email any different from everyone elses'?
The clout to have it buried or lost.
All plates must be (1) securely fastened so as to prevent them from swinging, (2) displayed horizontally with the identifying numbers and letters facing outward from the vehicle, and (3) mounted in the upright position. The person driving the motor vehicle shall keep the plate legible and unobstructed and free from grease, dust, or other blurring material so that the lettering is plainly visible at all times. It is unlawful to cover any assigned letters and numbers or the name of the state of origin of a license plate with any material whatever, including any clear or colorless material that affects the plate's visibility or reflectivity.
So in my state any cover one were to put over their plate, including those license plate frames dealers put on, would be illegal. At the same time if one were to rig up a system where one was dumping out massive amounts of IR around the plate in an effort to flood the image that would be legal. Also for the record there are no laws covering the IR emission from vehicles in Minnesota as all light emissions regulations deal with specific colors (white, blue, amber, and red) light, or with flashing lights.
I have done some digging into seeing if flooding ALPRs with IR is possible and while some people seem to say it isn't it seems like their efforts have been fairly half assed. They only put out a few watts of power instead of going for a few hundred watts of power. I want to build a frame that covers no part of my plate but will draw 20 amps at 12V and dump it into a large array of these IR LEDs. From the pictures I have seen where people photograph a 100 equivalent watt bulb showing that even that doesn't flood the image they just didn't take it far enough so ~200W going into some IR LEDs would be about as bright as a 1000 watt bulb which now is starting to get up into the range of back lit by the sun range type of power which will mess with the picture.
* By suspicious I mean someone who might have ties to any protest organization, be a naturalized citizen, have visited any strange countries, be a minority, committed a crime other than a traffic/parking ticket, or any other group the government may want to target or would be ignored by the news media. Basically it would be similar to driving while black, or the opposite of being a young white girl who gets murdered or put on trial in a foreign country. I hate to say it but it is sadly true that the general population would't care about your plight if you could be painted as an undesireable.