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I wonder if this means this will encourage criminals and gangs to stock up on rocket propelled grenades and other anti aircraft weaponry.

for a multirotor? How about a well-placed rock?

a roof mounted computer vision slingshot comes to mind.

sounds like a great way to get slingshots made illegal in L.A.

A well placed net or piece of wire lobbed at it would suffice. Seems like someone reasonably motivated could clear them from the sky easily.