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Propaganda leaflets dropped by Ukrainian drones over places where North Korean soldiers are hiding or moving in the Kursk region.
As we can see, Ukrainian UAV operators are aiming not only at the heads of DPRK mercenaries, but also at their new phobias - in the form of drones.
At the same time, giving them a choice: to surrender, escape from this horror and get a chance at a new life, or to die ingloriously and inevitably from an FPV drone or cluster munition.
Translation of the inscription: "Don't die in vain! Surrender is the way to survive."
A bad trip isn't fun even in the best of familiar environments. On the battlefield, it would lead to a very unpredictable situation in an already chaotic environment.
Psychedelics are so different from person to person, it could be extremely inhumane for some, but the exact opposite for others. In other cases, you might actually be improving the reflexes and eyesight of your enemy. (For example, my visual acuity gets substantially better and it's much easier for me to identify shapes against camouflage as an example.)
If no combat action is planned against a drugged opponent, it becomes much more humane in that regard. That entire division would absolute out of commission but trying to capture them could become even more dangerous. It's easier and cheaper to pin an enemy with a stream of bullets flying over their head, TBH.
Sorry, I am basically thinking out loud.
After thinking through a few scenarios regarding psychedelics, it would be pointless in most cases as the risks are higher than the rewards as its application would be extremely niche and would have to be combined with some other kind of deep psychological coercion. Otherwise, bullets and explosives are equally effective against someone who is drugged and someone who isn't.