A bit related in the topic (but unrelated in the outcome as this is a US story): Court Says Using Chalk On Tires For Parking Enforcement Violates Constitution.
"Trespassing upon a privately-owned vehicle parked on a public street to place a chalk mark to begin gathering information to ultimately impose a government sanction is unconstitutional under the Fourth Amendment," Taylor's lawyer, Philip Ellison, wrote in a court filing.
A three-judge panel of the U.S. Court of Appeals for the 6th Circuit unanimously agreed. Chalking tires is a kind of trespass, Judge Bernice Donald wrote for the panel, and it requires a warrant. The decision affects the 6th Circuit, which includes Michigan, Ohio, Kentucky and Tennessee.
The Fourth Amendment protects people from "unreasonable searches and seizures." To determine whether a violation has occurred, the court first asks whether the government's conduct counts as a search; if so, it asks whether the search was reasonable.
The court found that chalking is indeed a "search" for purposes of the Fourth Amendment, because government officials physically trespass upon a constitutionally protected area to obtain information. Just as the Supreme Court ruled in 2012 that sticking a GPS tracker to a car counted as a "search," so is marking a tire with chalk to figure out how long it has been parked, the court wrote.
And that search wasn't reasonable, the court said. The city searches vehicles "that are parked legally, without probable cause, or even so much as 'individualized suspicion of wrongdoing' — the touchstone of the reasonableness standard," the court wrote.