Lana: When I heard about Casey's symptoms... ...I had my contacts at the Isis Foundation have her transferred down here.
Clark: So this-- This isn't exactIy officiaI. He implies that no one knows about this? Lana: It is extreme. But if she had something to do with Scion... I couIdn't have other patients exposed to whatever was in her bIoodstream. Clark: What do you mean was?
Lana: Overnight, (suddenly or last night?) the metaI content in her body dropped dramaticaIIy. My team couId find hardIy any trace of zinc, magnesium or iron.
Top answer
official: he's reporting what he believes to be true but has not solid evidence overnight: the night before the previous reference [here, 'last night']
— Philip
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And I forgot to mention that Lana actually transfered that woman to the secret room in her foundation. So is Clark saying that because no one knows about the room maybe refering it's not an official treatment or he's saying no one knows about the whole process?