Which landmark decision established that suspects must be informed of their rights before interrogation?

The landmark decision that established the requirement for suspects to be informed of their rights before interrogation is Miranda v. Arizona. In this case, the U.S. Supreme Court ruled that individuals in custody must be made aware of their rights to remain silent and to have an attorney present during questioning. This ruling was significant because it aimed to protect the Fifth Amendment right against self-incrimination and ensure that any confession or statement made by a suspect is voluntary and informed. The decision led to the creation of "Miranda warnings," which law enforcement must provide to individuals upon arrest, thereby reinforcing the principle that a suspect must be aware of their rights in order to make an informed choice about waiving them.