Ernesto Miranda, you are arrested for a serious crime in the state of Arizona.
After being interrogated, Miranda voluntarily wrote up a confession saying that he had truly committed the crime saying that he had full knowledge of his legal rights. The confession was used against him in court...
Although Miranda obviously knew about his 5th and 6th Amendment right, he argued his side. He said he wasn't told by the officers that arrested him that he had "the right to remain silent." He also argued that he didn't have a lawyer present, which violated his 6th Amendment right.
I agree. Your confession is not to be used against you in any court or trial.
From now on, the precedent created was now that police had to inform you of your rights when you are under arrest. Named "The Miranda Warnings."
Even though Miranda's confession was not used, he was convicted a second time and this time went to jail.