I believe it was hydrogen cyanide, and I believe it was Iran.

> Starting about a decade ago, a small number of Americans, mostly federal employees and many of them working in intelligence, reported similar experiences in Havana. In an instant, they heard a painful ringing in their ears, followed by intense pressure on their head and disorienting vertigo, which was often followed by nausea. Some of the victims developed long-term problems with fatigue or mobility. Other officials later reported similar symptoms while in Russia and other foreign countries, and many concluded that they had been the victim of a deliberate attack with some kind of acoustic weapon.

ototoxic, vertigo, nausea, brain damage

A close inspection of the video evidence released by the morality police concerning Mahsa Amini is quite damning. It appears the morality police allowed some intelligence branch to operate / exercise on their premises but refused to be the scapegoat once things went south. So they released video of her walking healthily into the building, of her searching a seat, but not before quickly glancing back (presumably in response to her name, called out for target lock-on by a trainer / observer "O"). This scene as she selects a seat is also important because the girls are being processing FIFO. Compare the women who are seated right before Mahsa sits down, with the women who are seated as Mahsa stands up. Except for the observer "O", all the women who sat down earlier have been processed and are no longer there, and all the women sitting down as she stands up again were not there before. Except this observer sitting in the midst of the arrested women of course.

Pay close attention to unnecessarily early starts or unnecessarily late endings of the segments: what is it that morality police is showing and why? They are threatening the higher-ups that they have already shared the evidence (minus the explanations) to implicate higher branches of government.

An unnecessarily early start is when before Mahsa stands up (presumably there is a number display). She seems scared and impatient: instead of a morality police officer coming for her, 2 such morality police officers "Bossy" and "Postpony" are seen in discussion. Certain arm movements are seen (extending one arm, while hiding the other hand, presumably to hide a trigger / squeezing bulb). Annoyed "Bossy" is seen demonstrating the things-to-be-done presumably for the umpteenth time (she is clearly impatient with Postpony's stalling behavior). It looks like this would have gone on for quite a while more, were it not for Mahsa spontaneously arriving. I believe she was afraid of the hypothetical situation where she patiently waited until her number was explicitly called out, out of fear that if the morality police accidentally skips her processing, that she might end up in deeper trouble than she already is: they might accuse her of fleeing the morality police to avoid processing. Apparently Postpony was stalling, now that the target has arrived we will quickly see that when thrown in the water Postpony didn't need further instructions to swim. Some quick admonishing of clothing follows, during which suddenly the same arm movements we saw being demonstrated before are executed. Right after the hand or wrist passed close to Mahsa's face. Mahsa has a pain reaction (presumably the eye irritant intentionally added to hydrogen cyanide intended for disinfecting ships/factories/... which usually serves to warn end-users that they need to ventilate the closed space longer before entering). Immediately when Mahsa has the pain reaction and tries to cover her face with her hands, Bossy and Postpony turn their back long before she collapses, and they also take some steps away from any hydrogen cyanide cloud diluting in the air. This is not the body language of authoritarianism. It illustrates Bossy and Postpony knew exactly what could or would happen after administering the dose. Replay that scene and look at the behavior of observer "O". The hospital reported the girl was brain-dead, and the father responded weird pink spots on her skin (just like observed during the holocaust).

I suspect at least observer "O" works in a different branch (aking to Iran's equivalent to CIA training or possibly a chemical weapons scientist, gathering data for dosage setting). It's unclear if Bossy and Postpony are real morality police employees, working under direction of "O", or if they are from the same branch as "O", and pretending to be morality police, who would in that case have been instructed to let the 3 work freely using the facility as a training ground, with Bossy and Postpony pretending to be morality police.

The cochlear amplifier (the cochlea is a mechanical amplifier) is extremely sensitive to drugs. A lot of substances are ototoxic. Imagine unknowingly suffering a non-lethal dose of brain damage, involving ototoxic tinnitus. A cluster of victims emerging above the spontaneous incidence background could share many symptoms, and in the absence of help could erroneously conclude an "acoustic directed energy weapon". Then this is cross-referenced with the symptoms of known directed energy weapons, and promptly considered to be mass hysteria.

During WWI the British developed hydrogen cyanide bombs to launch at German positions. Clearly some chemists in the British army didn't want to be involved in chemical warfare and chose a lighter than air poison gas, so that it would quickly evaporate and diffuse, as opposed to the other trench war chemical weapons.

Hydrogen cyanide may not be effective in trench wars, it seems Iran still considers it effective for assassination, debilitation.