A friend called the police about Tony Robinson because he was worried about Tony; another said he wasn't acting like himself.
I haven't heard any toxicology reports yet, but I wonder.
I gather the "bath salts" are designer drugs, though I've no good idea who designed them. I presume they were designed to create a powerful or long-lasting "high." If I were the chemist I'd be pretty nervous about using trial and error on myself with such things, so probably the alpha testers are unsuspecting addicts.
I started wondering if somebody had designed drugs to induce overwhelming depression.
There will always be hidden suicidal problems in some percentage of the population, and it is possible--arguably likely--that the semi-prominent include a higher percentage. And, to complicate matters, cultural pressures aren't the same now as 30 years ago, so it isn't easy to compare statistics from different eras. I conclude that it wouldn't be easy to figure out if someone was weaponizing such drugs.
Where would you look to find out? Russia might be a good place to start. They've the resources to develop the tools, and an adequate supply of ruthlessness. I don't know if the extra level of deniability outweighs the salutary terrorizing effect for Putin, though, so maybe for domestic dissidents he'd still use thugs. But overseas would be a different matter. If Russian opponents overseas started killing themselves at a surprising rate that might be a clue. Or high suicide rates in Chechnya.