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Ground lasers unlikely to be effective at the balloon altitudes, and especially with atmospheric interference (eg. weather, moisture, etc). Airborne and/or space-based lasers are a different story and may work well when they're ready to be deployed. I believe the plan-based solutions are in trials.

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I was interested in checking whether any treaties exist to limit the use of space based lasers.. and surprised to see that there are no rules against using them.

https://digital-commons.usnwc.edu/ils/vol93/iss1/6/

I would be sincerely surprised if there were any treaties, since I don't think any space lasers have ever been used.

There's one in place for WMDs, and I don't think one was ever delivered from space.

Of the Gentile variety, anyway

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