Lenore Walker is best known for her description of "battered woman syndrome" through the 1970s which is now associated with post traumatic stress disorder (PTSD). Which of the following is/are true about 'battered woman syndrome?" (select all that apply)
a. Across the United States and in most of the world, if a woman kills her violent partner, battered woman syndrome is a frequently used legal defense
b. Expert testimony depends on whether the expert uses scientifically validated methods in their field as related to battered woman syndrome
c. Feminist critiques of "battered woman syndrome" include the perspective that women suffer an irrational disorder rendering them incapable of self-control
d. If the defense of "battered woman syndrome" is to be used via expert testimony, the defense/prosecution must establish that the jury/judge would be aided by such expert testimony as an explanation of a woman's behavior