Q: What happens if a person lies to a grand jury? Can they till be used as a witness?
If a person testifies differently at a Grand Jury, that person can still be used as a witness by the DA due to a rule of evidence that allows "prior inconsistent statements to be offered as substantive evidence." If the DA calls this person to the stand at trial after the Grand Jury they are implicitly stating that the testimony at the GJ changed because of threats or just having "cold feet" about the prosecution, not because the witness is necessarily lying.
Here is a related topic on my blog - http://linklawphilly.com/when-a-witness-goes-south/
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