Hard to act against smoking near windows, says minister

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Note the interesting comparison with being naked in own house, which is considered a crime in Singapore.

"Being naked in your own home doesn't kill your neighbour but second-hand smoke could."

Given the current technology, it would be challenging to track down the smoker or obtain evidence of an act of smoking being committed without rather intrusive methods, Ms Fu said, adding that this would affect even the privacy of innocent neighbours.

Qn: How far should a state have a right to monitor the actions of people within its borders? (Cam. 2007)