Is kettling a valid police tactic? (poll 6257222)

Is kettling a valid police tactic?

Yes, I have no problem with the way it's been used in Canada.

Yes, but police should follow guidelines on its use.

Yes, but it should only be used in extraordinary circumstances.

No, there are too many issues with the tactic for police to use it.

I'm not sure.

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See this poll on: https://poll.fm/6257222/embed