all 3 tox screens came up negative.

三人的毒理检查均显示阴性
Well, they only screen for known compounds.

他们只针对已知药品进行了检测
This could be a cocktail we've never seen before.

可能是一种我们没见过的新品
Every drug affects every person differently,

药品对各人的影响是不一样的
yet somehow this unsub is able to make his drug

但不知为何此嫌犯让这种药
affect 3 completely dissimilar people exactly in the same way.

在三个完全不同的人身上发挥了相同的作用
Maybe they're not dissimilar at all.

也许他们不算完全不同
Maybe the drugs are just the tipping point

也许药物只是个导火索
and these 3 share some sort of pre-existing mental condition

而这三人可能原本就拥有某种相同的精神问题
he knows he can tap into to induce them to kill.

他知道他能利用这点让他们大开杀戒
We find that, we find him.

查出这个就能抓到他
Did she feel a lot of pain?

她死前受了很多苦吗