The solution is to report them (Destiny)

by Earendil, Wednesday, December 16, 2015, 17:13 (3533 days ago) @ MacAddictXIV

Maybe there is a way to characterize lag switcher network traffic in a way that would never find false positives. But unless Bungie can create that, the answer is "you know lag switching when you see it" and you report them and have Bungie look into it.

Even if Bungie did have a sniffer that caught lag switchers and created no false positives, it would inevitably let some slip through. Again, the answer to that would be to report them.

The only surefire way to get rid of them instantly is to have everyone that experiences a moment of bad connectivity be auto banned, or auto forfeit. But that would suck for a lot of legit players really quickly. Most games can handle a truly random spurt of lag, because in most games you'd never even notice two players being out of sync for half a second because they aren't actively engaged. Again, lag switchers become a "you know it when you see it", because to experience lag happens, to experience lag at exactly that point in the game is... how does Beorn put it? Or yes, "bullshit".