There are several methods one could utilize when introducing a weaponized toxin to a human subject. Today we will disregard the use of solid forms as this method would not be effective in combat scenarios. Because toxin directly affects the brain, inhalation would be the most efficient way to utilize toxin, however, I worry that too many people anticipate this method of administration and as such repare accordingly, rendering the toxin ineffective. This leaves injection as the most viable alternative, however, subcutaneous, intradermal, epidural, intra articular, intrathecal, and intraosseous are all rendered useless simply by the time needed to adequately prepare. Intracavernousal injections, though amusing to consider, would only work on half of the human population and contrary to popular belief would not affect the brain. Intravitreal injections, while in ineffective for the task in hand, would be better used a means to induce fear rather than for the transference of toxin. Side not analyse statistics regarding belonephobia and possibly trypanophobia, clarification pending. With this in mind, intracardiac and intramuscular injections are the only two efficient methods presently at hand. No, no, intracardiac is all but obsolete and would require a bare chest to utilize effectively. There’s no way a needle could breach any form of body armour or thick clothing it would have to be an intramuscular injection. This would result in a slower rate of delivery but with the right apparatus, an unpreventable one. Bioavailability would be lowered –compensate with increased dosage. Testing will be required. So much testing.

Reminder, take notes on Intravenous application, include peripherally inserted central catheters. This could be effective in prolonged fear-based stasis. Logged as Entry Crane 002.
Addendum: Subject EN has gone dark. Suggest either tracking apparatus has been found and destroyed, or subject has been disabled. The latter would be… unfortunate.