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The compound cannot be ingested, as stomach acid breaks it down too easily. Injection works, but training is more effective if the subject is unaware of their altered mental state, which is unlikely in that scenario. Fortunately, the compound can be absorbed through the skin, making clothing dye an effective vector.
However, this approach introduces new challenges. Namely, how to communicate instructions to the subject during the window of effectiveness of the compound?
Fortunately, some subjects solve that problem for themselves…