You are probably correct. However the concept of brainwashing is established
as real, mental hospitals are full of people who self damage etc. However I doubt iether side is going to wish to call expert witnesses. Less Marty/Mosey call on Dr Martha
Stout.
This post does show Marty's viewpoint of DM, also shows several areas where DM is very vulnerable and indicates Marty/Mosey will go for all of them.