Daryl Crozier, a Canadian physicist at Simon Fraser University who works on super powerful beams said, "It would be impractical to kill a person with a high power laser beam. There are many easier ways of doing so."
I would add that the U.S. military is quietly working on battlefield laser weapons. They are limited from full development/deployment more from humanitarian considerations than technical (e.g., blinding is not a nice thing to do even in war!).
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