I don't know. and I haven't had any in 4 yrs.
I asked the the same question repetitively and stare at them, they'd usually give in when I asked cuz I great at annoying people dunno why
Facial movements/ tone. and a little to often.
I feel their manipulative pull, the NEED to persuade or sell their bullshit
I just know when people lie, I took a course that was done by an FBI profiler on lying. And I lie all the time it's like 95% of what i do