Tiffany v. Boatman's Institution was a United States Supreme Court case in which the Court held that a bank could not be held liable for a customer's negligence in failing to properly secure a safe deposit box. The case arose when a customer of Boatman's Institution, a bank in St. Louis, Missouri, rented a safe deposit box and placed valuable jewelry in it. The customer failed to properly secure the box, and the jewelry was stolen. The customer then sued the bank for negligence, claiming that the bank should have taken steps to ensure the security of the box. The Supreme Court held that the bank could not be held liable for the customer's negligence. The Court reasoned that the bank had no control over the customer's actions and that the customer was solely responsible for the security of the box. The Court also noted that the bank had taken reasonable steps to ensure the security of the box, such as providing a lock and requiring the customer to sign a rental agreement. In conclusion, the Supreme Court held that the bank could not be held liable for the customer's negligence in failing to properly secure the safe deposit box. The Court reasoned that the bank had taken reasonable steps to ensure the security of the box and that the customer was solely responsible for the security of the box.

In Tiffany v. Boatman's Institution, the Supreme Court was asked to decide whether a bank could be held liable for failing to pay out funds that had been deposited with them by an individual who had died before they were able to collect on their deposit. The majority opinion found in favor of the bank and held that it did not have any legal obligation to pay out the money since there was no contract between them and the deceased depositor. However, Justice Field dissented from this decision and argued that banks should be held responsible for honoring deposits made by individuals even after death if those deposits are still valid at the time of death. He reasoned that banks should not be allowed to benefit from someone else’s misfortune simply because they failed to act quickly enough when notified about a customer’s passing away. Furthermore, he noted how such a ruling would create an unfair situation where people would hesitate in making deposits due fear of losing their money if something happened before they could withdraw it themselves.