The main issue with the "mad/unethical scientist" trope is that breaking laws or ethical standards yields useless data. Donna Chambers (aka Nurse Rita) can't use any of the insights she gains from her field experiment with Mr. Jingles--can't publish them, or ever disclose her actions. The best she can hope for is to eventually formulate a series of legal experiments that would replicate what she learned, as a means of sharing the findings with the scientific community.
Even her personal use of what she learns would be limited in terms of working directly with murderers or young people thought to be on the path to becoming a murderer, because there will always be some level of scrutiny over a psychologist's methods. If she yields important data, she will be consigning herself to a career of faking her dissertation and future publications in order to leave out whatever she learned illegally or unethically, creating a frustrating sort of double life; and of scrupulously working to make sure any theories she deploys in therapy sessions don't ever out her illegal activities.
Even her personal use of what she learns would be limited in terms of working directly with murderers or young people thought to be on the path to becoming a murderer, because there will always be some level of scrutiny over a psychologist's methods. If she yields important data, she will be consigning herself to a career of faking her dissertation and future publications in order to leave out whatever she learned illegally or unethically, creating a frustrating sort of double life; and of scrupulously working to make sure any theories she deploys in therapy sessions don't ever out her illegal activities.
The ammunition can that "Mr. Jingles" uses to store items under his bunk actually has a March 1986 manufacturing date on it (86C) which is plainly visible when Margaret places the severed ears into it in a 1970 flashback.
The utensil Bertie uses to make the PBJ sandwich for Jingles is a frosting spreader/smoother for cake decorations, and she holds it upside-down, to boot.