The restricted access to the institute, the use of laboratory chemicals, and the fact that the killer knew how to mix them, all pointed to the involvement of someone inside the institute.
由輻生所的門禁、實驗室裡的藥劑曾被動用，以及兇手熟知調配化學藥劑等線索，涉案人直指輻生所內部人員。