Can appellant plead not guilty to a charge of perverting the course of justice in a criminal case?

In any event, by taking the stand, appellant effectively waived his privilege against self-incrimination. Having done so, he cannot be permitted in the same case to invoke the Penal Code section 1324 immunity defense for testifying on the same matter in the trial of his coparticipants in the same [10 Cal.App.4th 1466] crimes. As the court in Brown v. Walker, supra, 161 U.S. at page 597, 16 S.Ct. at page 647, observed: "[I]f the witness himself elects to waive his privilege, as he may doubtless do, since the privilege is for his protection and not for that of other parties, and discloses his criminal connections, he is not permitted to stop, but must go on and make a full disclosure. [Citations.]"