4 ms·the synthetic precursors are.by rolph 2y agothe synthetic precursors are.15155 2y agoWhich? All of the weaponized forms involve some pretty nasty flourinated precursor chemicals which themselves are quite toxic -- and controlled.rolph 2y agoall of them. if you understand chemistry; nasty, quite toxic, and controlled are not barriers. e.g. isopropyl alcohol.