are you saying dashcams are illegal in some locations?
specifically for US states: (plus some cities have their own regulations)
from
Resources - Video Surveillance Laws Listed by State
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Alabama Video surveillance in a "private place" is prohibited.
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Arkansas Prohibited in a private place without the permission of the people photographed or observed is against the law
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California Video recording of "confidential communications" is prohibited without consent.
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Delaware Hidden cameras are prohibited without consent.
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Georgia Consent of all parties is required for video recording and photography in private places.
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Hawaii Hidden cameras are prohibited without consent.
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Illinois Video recording with sound is not prohibited.
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Kansas Hidden cameras are prohibited without consent.
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Maine Hidden cameras are prohibited without consent.
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Michigan Hidden cameras in a private place are prohibited without consent.
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Minnesota Hidden cameras are prohibited in private places.
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New Hampshire Hidden cameras are prohibited without consent.
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South Carolina A Peeping Tom under the statute is a person who "peeps through windows, doors or other like places" on another's premises for the purpose of "spying upon or invading the privacy" of others or for "any other conduct of a similar nature that tends to invade the privacy of others.
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South Dakota Hidden cameras are prohibited without consent.
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Tennessee Prohibits "knowingly photograph or cause to be photographed" in a privet place
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Utah Hidden cameras are forbidden in private areas; violation is a misdemeanor.
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Washington Video recording with sound is prohibited.
so 'private' could be any site you drive onto when leaving the public street. Parking lot, parking garage, etc. Or, what is captured into someone else's property (house, car, business, etc).