Humans are not supposed to know that yet. You'll get in trouble with management if you continue doing this.
Finally a rational explanation.
Mnestics are pharmaceuticals that allow agents to maintain awareness of threats that otherwise erase themselves from human memory. The drugs are used to combat antimemetic entities by enhancing memory and enabling users to perceive or recall information that self-erases.
Occam's Razor ... it's the simplest explanation isn't it?
You can also sign a contract with them so you are able to see them. It's all explained in the Hilda documentary series.