During one interview. MCM said something to the effect of being absolutely certain "without a doubt this has nothing to do with our pasts''. That means (to me) that the only way she could know that with certainty is she actually DOES know what happened and knows it is unrelated to prior acts of violence, drug use, incarceration.
Am I making any sense ?
Flat affect can be cause by any number of things, including but not limited to mental illness (severe PTSD), stroke, medication, ABI/TBI, and possibly drug abuse. I have one client who has a very flat affect when compliant with meds but get her on the upside of a manic phase and watch out, she is on fire.