Sociopaths are instinctive liars.

They lie to everyone --- including themselves. They can't help it, it's a structural issue with their brain that can't be fixed with drugs.

This is not to say they are dumb. They learn over time what the rest of the world expects from them and how to fake it in order to fit in.

They learn rather quickly that they are expected to exhibit empathy --- even tbough they don't actually feel it.

In other words, a lot of mature sociopaths could easily pass this simple, transparent test. And I know enough about ASPD (learned the hard way) that I could easily fail it if I chose to.