I am well aware of the requirements to be deemed legally insane. Why would the Joker need an entire legal dream team to make sure his diminished capacity defense works? This is the Joker we are talking about. Everything he says and does screams insane, right? Shouldn't any just-out-of-law-school public defender be able to prove that? Why would he need an entire team of lawyers? He is a highly intelligent planner capable of accounting for all contingencies including even the Batman but he decides to hire an entire team of lawyers? If your answer is because he is crazy then you have fallen into his trap.
Did you know that feigning legal insanity has a name, Malingering. David from the Bible (Yeah the one who slew Goliath) did it to escape a king who was about to kill him. David succeeded in his malinger and escaped death, and he was not insane despite being ruled as such by the ruler of that nation. This legal/social tactic has centuries of backing to the point that a 21 point detection system was invented.
Here are some of the ways of detecting a malinger. See how long it takes you to find one that fits the Joker. (Hint: It won't take you long.)
1. Dramatic or atypical presentation
2. Vague and inconsistent details, although possibly plausible on the surface
3. Long medical record with multiple admissions at various hospitals in different cities
4. Knowledge of textbook descriptions of illness
5. Admission circumstances that do not conform to an identifiable medical or mental disorder
6. An unusual grasp of medical terminology
7. Employment in a medically related field
8. Pseudologia fantastica (i.e., patients' uncontrollable lying characterized by the fantastic description of false events in their lives)
9. Presentation in the emergency department during times when obtaining old medical records is hampered or when experienced staff are less likely to be present (e.g., holidays, late Friday afternoons)
10. A patient who has few visitors despite giving a history of holding an important or prestigious job or a history that casts the patient in a heroic role
11. Acceptance, with equanimity, of the discomfort and risk of diagnostic procedures
12. Acceptance, with equanimity, of the discomfort and risk of surgery
13. Substance abuse, especially of prescribed analgesics and sedatives
14. Symptoms or behaviors only present when the patient knows he is being observed
15. Controlling, hostile, angry, disruptive, or attention-seeking behavior during hospitalization
16. Reporting of wild psychological symptoms, and silly wrong answers on questionaires, not likely in patients with similar but real conditions.
17. Fluctuating clinical course, including rapid development of complications or a new pathology if the initial workup findings prove negative
18. Coinciding indigence or homelessness of the patient, with impending cold weather and a need for indoor lodgings.
19. Giving approximate answers to questions, usually occurring in factitious disorder with predominantly psychological signs and symptoms (see Ganser Syndrome)
20. Eagerly endorsing symptoms suggested by a clinician, but not mentioned by the patient, though they would have been prominent and obvious had they been real.
21. A test for factitious mental disorders presents symptoms which are extremely improbable. Endorsing these symptoms which almost never occur can raise doubt of the person's sincerity.
As you have stated, he is a compulsive liar. All of his actions, words, and behaviors are lies meant to keep up his malinger which is facilitated by his super sanity. His Super Sanity allows him to commit to any course of action he chooses with nearly his entire mind, body, and soul.
It should also be mentioned that the report that Harley wrote was before she had her own psychotic break from reality. Her report would also have likely earned the Joker the death penalty had she not been turned by him. Why would Harley write a report like this that could get her lover possibly put to death?
As I have said, the Joker is only crazy when he chooses to be crazy. This
is his superpower.
Now if this does not make the Joker interesting to you, then so be it.
Weave bullshit? You wound me, sir. I only use bullshit for papers. This is not for a grade, I don't have a page requirement.