Have your brother retest you with muscle testing the arm.
Have him put his pointing finger and the finger next to it together, touching the knuckle side right between your eyes while he tests your arm for strength.
Then have him change the fingers to the other side, and touching the other side to the same spot, in between your eyes, have him then test the arm for strength again.
It should show strong one way, and weak the other.
The Alternative Dr won't do any kind of biofeedback testing, including muscle testing, without first doing this. If it shows the same result both ways, you are not testable.
The other thing is, make sure you are hydrated..and make sure you don't have a Cell Phone or other metals on you.