Robot Recognition - How would you build this?

[nerdvana]

I am working on an emulation of Gamma World... in it Pure Strain Humans are recognized as "being humans" by most robots, mutant humans are sometimes recognized this way but not always, mutant animals can occasionally be recognized that way also but mutant plants cannot ever be (naturally, this is for robots that retain their original programming.

Would this best be a trait of the robots (thus it can be changed innately with their programming), a trait of the characters or both? That beiing answered, how would you stat it?

I was thinking that it would be a trait of the character's and be built as a Reputation (robots only, etc... thus a reaction modifier) but I began to second guess this.