It's a nice right in theory, but in reality, stop-and-frisk, border control, parallel construction, 'I smelled weed in the car', 'I had a hunch', 'the drug dog gave me a signal', 'we got an anonymous tip (from an illegal search, via parallel construction)' all exist, and are regularly employed in the United States.
They also tend to be disproportionately targeted at particular, inconvenient, segments of the population.
They also tend to be disproportionately targeted at particular, inconvenient, segments of the population.