Final answer:
HIPAA is the law that dictates the specifics for keeping Mr. Madrigal's prescription information confidential.
Step-by-step explanation:
The law that dictates the specifics for keeping Mr. Madrigal's prescription information confidential is the Health Insurance Portability and Accountability Act (HIPAA). Passed into law in 1996, HIPAA sets standards for the protection of patient information and requires businesses that use health information to maintain strict confidentiality of patient records. HIPAA is designed to ensure the privacy and security of patients' medical information.