When Tsarnaev was captured, authorities indicated they did not intend to read him his Miranda rights, which include the right to remain silent, the right to an attorney regardless of financial circumstances and the warning that any statements can be used to aid his prosecution.
http://www.cnn.com/2013/04/21/us/boston-suspect-miranda-rights/index.html
Arrests can occur without the Miranda Warning being given. If the police later decide to interrogate the suspect, the warning must be given at that time. Their vigilance to this rule means less chance of a case being overturned in court due to poor procedure on their part.
http://www.mirandawarning.org/whatareyourmirandarights.html
Some legislators, notably U.S. Sens. John McCain of Arizona and Lindsey Graham of South Carolina, want the suspect declared an enemy combatant, a designation that allows a suspect to be questioned without a lawyer and without being informed of his Miranda rights.
http://www.cnn.com/2013/04/21/us/boston-suspect-miranda-rights/index.html
It's a designation that allows investigators to question a suspect before apprising him of his rights when they believe there is an imminent public safety threat. The public safety exception dates back to a 1984 case, New York v. Quarles. Its most recent interpretation dates back to a 2010 memo by the Obama Justice Department, and it was explained in a 2011 FBI bulletin.
http://www.cnn.com/2013/04/21/us/boston-suspect-miranda-rights/index.html
163) In examining the police officer's intent to evade Miranda, the court highlighted the police officer's statement that he executed a strategy to not. [the suspect] until he saw the video, (164) due in part to the officer's prior knowledge of the suspect's familiarity with Miranda.
http://legal-dictionary.thefreedictionary.com/Mirandize
Interrogation first, Miranda warnings afterward: a critical analysis ... by Rodriguez, Joshua I. / Fordham Urban Law Journal. The problem with the rule, Bonner said, It's a burden to almost. the listener in a county where the judge and the elected official might live next door to each other.
http://legal-dictionary.thefreedictionary.com/Mirandize
Law enforcement officials only have to Mirandize a suspect if they intend to use his statements at trial. In the Tsarnaev case, however, the federal government is invoking the public safety exception, a Justice Department official told CNN on condition of anonymity.
http://www.cnn.com/2013/04/21/us/boston-suspect-miranda-rights/index.html
Further, if the accused person confesses to the authorities, the prosecution must prove to the judge that the defendant was informed of them and knowingly waived those rights, before the confession can be introduced in the defendant's criminal trial. The warnings are known as Miranda Rights or just rights.. The Miranda rule supposedly prevents self-incrimination in violation of the Fifth Amendment to the U. S. Constitution.
http://legal-dictionary.thefreedictionary.com/Mirandize
The suspect must give a clear, affirmative answer to this question. Silence is not acceptable as waiving these rights because the arrestee may not understand or may not speak English as his or her first language. If the Miranda Warning must be translated to the suspect, that translation is usually recorded.
http://www.mirandawarning.org/whatareyourmirandarights.html
The wording used when a person is read the Miranda Warning, also known as being ‘Mirandized,’ is clear and direct: “You have the right to remain silent. Anything you say can and will be used against you in a court of law. You have the right to an attorney. If you cannot afford an attorney, one will be provided for you.
http://www.mirandawarning.org/whatareyourmirandarights.html
when to mirandize a suspect
Mirandize a suspect if they intend to use his statements at trial.