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While that’s true, that is not what prompted the prosecution’s subpoena. The sixth amendment right to confront one’s accuser means that the defendant has the right to cross-examine the state’s witnesses against him/her. The state need not call any particular witness if it chooses not to do so, but then that person’s testimony won’t be heard by the court (jury) and cannot be used against him.
Instead, the prosecution is issuing the subpoena because he/she wants the victim’s testimony to help make the case against the defendant. The reason that the witness may be compelled to testify pursuant to the subpoena is the state law that grants the power of subpoena and provides for the sanctions for those who do not comply with them. In other words, the witness here is not compelled by the Constitution to testify, but rather by the state law regarding subpoenas. Once the witness gets on the stand to testify, the defendant’s sixth amendment Constitutional right to confront his accuser will kick-in, allowing his lawyer to cross-examine the witness.