They just Eviscerated the 5th Amendment. They say that you cannot be forced to testify, but if you don’t, a prosecutor can use your silence against you:
Because merely keeping quiet when police ask damaging questions is not claiming a right to silence, the Supreme Court ruled Monday, prosecutors may use that silence against the suspect at the trial. If an individual is voluntarily talking to the police, he or she must claim the Fifth Amendment right of silence, or lose it; simply saying nothing won’t do, according to the ruling.
The Court had taken on the case of Salinas v. Texas to decide whether it violates the Fifth Amendment for prosecutors to use pre-arrest silence as evidence of guilt. But the Court did not reach that issue, since it said that one must say something that invokes the Amendment’s protection, or else it does not apply. Prosecutors’ use of the silence is then permitted, it ruled.
“A witness’s constitutional right to refuse to answer questions depends on his reasons for doing so, and courts need to know those reasons to evaluate the merits of a Fifth Amendment claim,” Justices Samuel A. Alito, Jr., wrote. The Court rejected the argument that, because suspects do not know the law, their silence should be understood as a Fifth Amendment plea.
Basically, if you are rich enough to have a lawyer, you can invoke that, but if you are too poor for one, then invoking the 5th Amendment in any way other than a specific and precise legalistic manner, it will be used against you.