In 5-4 decision, the Supreme Court ruled that a defendant's silence can be used against them in court if they choose to remain silent without specifically invoking the fifth amendment during pre-arrest questioning.
As a result of this ruling, it is the responsibility of the individual being questioned to know their rights. Since the individual being questioned can leave at any time, the court held that it is not the responsibility of the police to inform them of their rights. According to Tim Lynch of the Cato Institute, "The Court said Salinas simply remained silent and did not “formally” invoke any constititional right, so prosecutors could offer commentary to the jury."
The decision fell along ideological lines with Justice Kennedy acting as the swing vote and joining the more conservative jurists in their decision.
My advice: Don't ever talk to the police without an attorney.