322
Opinion of the Court
hended within its scope, but for now it suffices to note the general rule.
The justifications for the rule of waiver in the testimonial context are evident: A witness may not pick and choose what aspects of a particular subject to discuss without casting doubt on the trustworthiness of the statements and diminishing the integrity of the factual inquiry. As noted in Rogers, a contrary rule "would open the way to distortion of facts by permitting a witness to select any stopping place in the testimony," 340 U. S., at 371. It would, as we said in Brown, "make of the Fifth Amendment not only a humane safeguard against judicially coerced self-disclosure but a positive invitation to mutilate the truth a party offers to tell," 356 U. S., at 156. The illogic of allowing a witness to offer only self-selected testimony should be obvious even to the witness, so there is no unfairness in allowing cross-examination when testimony is given without invoking the privilege.
We may assume for purposes of this opinion, then, that if petitioner had pleaded not guilty and, having taken the stand at a trial, testified she did "some of it," she could have been cross-examined on the frequency of her drug deliveries and the quantity of cocaine involved. The concerns which justify the cross-examination when the defendant testifies are absent at a plea colloquy, however. The purpose of a plea colloquy is to protect the defendant from an unintelligent or involuntary plea. The Government would turn this constitutional shield into a prosecutorial sword by having the defendant relinquish all rights against compelled self-incrimination upon entry of a guilty plea, including the right to remain silent at sentencing.
There is no convincing reason why the narrow inquiry at the plea colloquy should entail such an extensive waiver of the privilege. Unlike the defendant taking the stand, who "cannot reasonably claim that the Fifth Amendment gives him . . . an immunity from cross-examination on the matters
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