Titan_Atlas
No, but a professional can diagnose a person who's schizophrenic by talking to them and learning about their feelings and behavior, right? It's not a matter of believing them when they say they're believing followed, it's a matter of acknowledging that there's a reason they believe it.
"Mentally ill" is a loose term (and one that the American Psychiatric Association no longer uses to describe trans people) that encompasses a wide range of conditions that affect people in a wide variety of ways. It does NOT mean "this person is crazy and can't be trusted to answer questions about himself in order to make a diagnosis".
I'll ask you again to consider the studies that were done that showed that trans people's brains were different from regular people and that they reacted to a chemical scent differently than regular people. They did these tests on people that had been DIAGNOSED with gender dysphoria. If the people they were observing had not actually suffered from GD, then they wouldn't have gotten the results they did. Clearly the diagnosis process was doing something right, and it's beyond foolish to insist that we simply can't diagnose GD because "feelings" are involved.