Facial recognition technology (FRT) may need to be regulated in much the same way as some ethically sensitive medical techniques to ensure there are sufficient safeguards in place to protect people's privacy and freedoms.

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When tragedy strikes, it has become commonplace to see witnesses capturing the scene on their smartphones. But a growing number of people are licensing those clips, and turning a profit from gruesome or tragic events. BBC Trending has taken a closer look at the industry that makes it possible.

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