If Dr. Hartnell discovers that Dr. Troughton's network does not support encryption, what should he do?

Sending a copy of the report using LSU Health FileS is the correct strategy in this situation because LSU Health FileS is designed to securely transmit sensitive information and comply with privacy regulations. Using this system ensures that the report remains protected during transmission, aligning with both institutional policies and compliance requirements regarding the handling of sensitive data.

In contrast, the other options expose the information to greater risks. Copying the report to a thumb drive and mailing it could lead to interception or loss during transit, thereby compromising the confidentiality of the information. Setting up a Dropbox account may not provide adequate security measures that are necessary for sensitive data and could violate institutional policies. Utilizing a personal email address is risky as it lacks the necessary security features found in official institutional channels, making it vulnerable to unauthorized access or breaches.

Overall, the use of secure institutional tools like LSU Health FileS is vital for protecting sensitive information and ensuring compliance with applicable laws and regulations.