Traffic police who mark car tires to track how long you've been parked has been ruled unconstitutional by an appeals court in Ohio, which classifies the action as an "unreasonable search."
Chalking tires is unconstitutional, court declares - FM100.3
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Chalking tires for parking tickets is unconstitutional, court rules
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Chalking tires for parking enforcement ruled unconstitutional by
Lose the Chalk, Officer: Court Finds Marking Tires of Parked Cars
Chalking tires to enforce parking rules is unconstitutional, court