Prosecutors are given broad freedom to conduct their investigations throughout the grand jury process; their power is not without legal and ethical limits, however. For example, courts have discretion to quash subpoenas that have been issued without a proper purpose.

中文翻译：

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虚假传票和检察道德

检察官在整个大陪审团过程中享有广泛的调查自由；然而，他们的权力并非没有法律和道德限制。例如，法院有权撤销没有正当目的发出的传票。