The available evidence suggests that it discourages behavior such as police brutality. Another upside is that it would be harder to get away with crimes or to escape blame for accidents. But a world of cameras could have subtle negative effects. The flood of data we pour into the hands of Google, Facebook and others has already proved a mixed blessing. Those companies would no doubt be willing to upload and store our body-cam data for free, probably with the assistance of machine learning algorithms(算法)-but at what cost to privacy and freedom of choice? Body-cam data could also create a legal mine field. Disputes over the validity and interpretation of police footage(执法镜头)have already surfaced. Eventually, events not caught on camera could be treated as if they didn't happen, like a tree falling in the forest. Alternatively, footage could be faked or doctored to escape blame or incriminate others.

　　Of course, there's always the argument that if you're not doing anything wrong, you have nothing to fear. But most people have done something embarrassing, or even illegal, that they regret and would prefer hadn't been caught on film. People already inspect their social media feeds-or avoid doing anything inadequate in public-for fear of damaging their reputation. Would widespread application of body cams have a further frightening effect on our freedom? The always-on-camera world could even threaten some of the natures that make us human. We are natural gossips and backbiters, and while those might not be desirable behavior, they oil the wheels of our social interactions. Once people assume they are being filmed, they are likely to shut up. We are nowhere near that point yet where everyone will feel they need one as an insurance policy, but we should think hard about whether we really want to say lights, body cams, and action.

1.What is the benefit of filming to average people?

A.Promoting the widespread use of smartphones in public.

B.Fighting crimes or bad behavior by providing solid evidence.

C.Guaranteeing cyclists and pedestrians more safety on roads.

D.Encouraging better performance of the police and teaching staff.

2.In the author's view, the data flooding into tech giants is fairly 　　　.