How have case law rulings and legislative acts impacted the practice of professional psychology?

How did the Tarasoff decision affect the professional practice of psychology?
How did the Jaffee v. Redmond Supreme Court ruling clarify the concept of privileged communication in psychotherapy?
What effects have the HIPAA regulations had on the way professionalpsychology is practiced?
Overall, do you feel that case law decisions and governmental (legislative) regulations have helped or hindered the practice of psychology? Explain.

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