One reason I get annoyed trying to read a crime novel or watching a movie or TV show about police procedure is because so much of the fiction that purports to be "realistic" isn't. For example, only on TV or in the movies do police officers start reciting Miranda rights to the suspect while he's being hooked up out on the street. Well-informed officers wouldn't do this in real life, and for good reasons. When giving Miranda warnings, timing matters.
When the U.S. Supreme Court imposed Miranda warnings and waivers as a condition of the courtroom admissibility of a suspect's statements resulting from custodial interrogation, the stated rationale went like this: the combination of custody and police interrogation is so inherently compelling that any suspect subjected to this process must be presumed to have been compelled to talk; the Fifth Amendment forbids compelling a person to testify against himself in a criminal case; therefore, unless something is done to neutralize this presumed compulsion, no statement taken by custodial police interrogation could be admitted against the person at his trial.
What would be sufficient to neutralize the presumptive compulsion? The court's suggestion was a pre-interrogation warning of the rights to silence and to retained or appointed counsel, and of the risk that whatever statements the person made could be used against him in court. (Miranda v. Arizona)
The court did not say-and has never held-that warnings were required simply because the person was taken into custody (Rhode Island v. Innis), nor merely because a person not in custody was subjected to interrogation. (Schneckloth v. Bustamonte) Rather, the need for warnings is triggered by "the interaction of custody and official interrogation." Illinois v. Perkins)
Obviously, when arresting officers do not intend to begin their interrogation of a suspect the moment he is taken into custody, there is no need to give the warnings until later, just before interrogation is attempted. Although some might think that it can never hurt to Mirandize a suspect and that giving warnings at the time of arrest helps ensure that warnings are not overlooked, prematurely Mirandizing has potential drawbacks.
Warnings Inhibit Volunteered Statements
In the Miranda decision, the court noted that "Volunteered statements of any kind are not affected by our holding today." The reason for this is because volunteered statements have not been elicited by police interrogation. Therefore, even though a person is in custody, his volunteered statements (sometimes also called "spontaneous statements") are not inadmissible under Miranda, even though warnings have not yet been given.
The Supreme Court itself has acknowledged that its "compulsion-neutralizer" is actually a "confession inhibitor." "Miranda warnings may inhibit persons from giving information." (Oregon v. Elstad) In many cases, "Miranda warnings deter a suspect from responding." (New York v. Quarles)
This being true, why would an officer want to reduce the chance of obtaining potential volunteered statements by giving a gratuitous warning in advance of planned interrogation? If a suspect arrested in the field will not be interrogated until he is transported to the station and placed in an interview room, why risk the loss of statements the suspect might have blurted out during the ride by needlessly giving a warning that shuts him up?
Statistics from the FBI's Uniform Crime Reports show that during the years before the Miranda decision was issued in 1966, law enforcement officers in the U.S. cleared an average of 63 percent of the Part 1 violent crimes (murder, rape, robbery and aggravated assault). Immediately after Miranda, the clearance rate fell sharply, averaging only 45 percent ever since. This 18-percentage-point drop represents a 28-percent reduction in our ability to clear violent crimes, attributable solely to the effect that hearing a Miranda warning has on the suspect's willingness to admit his crimes.
Some officers believe it can never hurt to Mirandize, even when unnecessary. Maybe people who hold this unexamined view should talk to the victims (or their survivors) of the quarter-million homicides, one million rapes, five million robberies, and nine million aggravated assaults that have gone unsolved since 1966, simply because of Miranda.