That&#x27;s why I&#x27;m personally fine with doing surveillance without consent for research purposes - observing people behaving naturally seems to be the only way to get results that are not totally messed up by constraints of experiment design. People behave differently when they know they&#x27;re being studied, doubly so when they know what they&#x27;re being studied <i>for</i> and triply so if they&#x27;re being told to &quot;act normal&quot;.