According to the LA Times Rove May Not Yet Be An Official Target

Caveat: I am a dirt lawyer, not criminal law expert.
According to the LA Times Rove may not yet be an official target.

:"Luskin said Rove had been assured by prosecutors that he was not a target of the investigation. "We were advised recently that his status has not changed," he added".

As I recall if you are the target of a federal grand jury investigation you get a "Target Letter"  

From the Department of Justice's Criminal Resource Manual DOJ

9-11.150 Subpoenaing Targets of the Investigation
A grand jury may properly subpoena a subject or a target of the investigation and question the target about his or her involvement in the crime under investigation. See United States v. Wong, 431 U.S. 174, 179 n. 8 (1977); United States v. Washington, 431 U.S. 181, 190 n. 6 (1977); United States v. Mandujano, 425 U.S. 564, 573-75 and 584 n. 9 (1976); United States v. Dionisio, 410 U.S. 1, 10 n. 8 (1973). However, in the context of particular cases such a subpoena may carry the appearance of unfairness. Because the potential for misunderstanding is great, before a known "target" (as defined in USAM 9-11.151) is subpoenaed to testify before the grand jury about his or her involvement in the crime under investigation, an effort should be made to secure the target's voluntary appearance. If a voluntary appearance cannot be obtained, the target should be subpoenaed only after the grand jury and the United States A ttorney or the responsible Assistant Attorney General have approved the subpoena. In determining whether to approve a subpoena for a "target," careful attention will be paid to the following considerations.

The importance to the successful conduct of the grand jury's investigation of the testimony or other information sought;

Whether the substance of the testimony or other information sought could be provided by other witnesses; and

Whether the questions the prosecutor and the grand jurors intend to ask or the other information sought would be protected by a valid claim of privilege.

9-11.151 Advice of "Rights" of Grand Jury Witnesses
It is the policy of the Department of Justice to advise a grand jury witness of his or her rights if such witness is a "target" or "subject" of a grand jury investigation. See the Criminal Resource Manual at 160 for a sample target letter.

A "target" is a person as to whom the prosecutor or the grand jury has substantial evidence linking him or her to the commission of a crime and who, in the judgment of the prosecutor, is a putative defendant. An officer or employee of an organization which is a target is not automatically considered a target even if such officer's or employee's conduct contributed to the commission of the crime by the target organization. The same lack of automatic target status holds true for organizations which employ, or employed, an officer or employee who is a target.

A "subject" of an investigation is a person whose conduct is within the scope of the grand jury's investigation

9-11.153 Notification of Targets
When a target is not called to testify pursuant to USAM 9-11.150, and does not request to testify on his or her own motion (see USAM 9-11.152), the prosecutor, in appropriate cases, is encouraged to notify such person a reasonable time before seeking an indictment in order to afford him or her an opportunity to testify before the grand jury, subject to the conditions set forth in USAM 9-11.152. Notification would not be appropriate in routine clear cases or when such action might jeopardize the investigation or prosecution because of the likelihood of flight, destruction or fabrication of evidence, endangerment of other witnesses, undue delay or otherwise would be inconsistent with the ends of justice.

 Sample Target letter

This letter is supplied to a witness scheduled to appear before the federal Grand Jury in order to provide helpful background information about the Grand Jury. The Grand Jury consists of from sixteen to twenty-three persons from the District of _. It is their responsibility to inquire into federal crimes which may have been committed in this District.

As a Grand Jury witness you will be asked to testify and answer questions, and to produce records and documents. Only the members of the Grand Jury, attorneys for the United States and a stenographer are permitted in the Grand Jury room while you testify.

We advise you that the Grand Jury is conducting an investigation of possible violations of federal criminal laws involving, but not necessarily limited to *. You are advised that the destruction or alteration of any document required to be produced before the grand jury constitutes serious violation of federal law, including but not limited to Obstruction of Justice.

You are advised that you are a target of the Grand Jury's investigation. You may refuse to answer any question if a truthful answer to the question would tend to incriminate you. Anything that you do or say may be used against you in a subsequent legal proceeding. If you have retained counsel, who represents you personally, the Grand Jury will permit you a reasonable opportunity to step outside the Grand Jury room and confer with counsel if you desire.

Cordially,

Are there any lawyers with experience in this area of law out there who can shed more light on this?  Will any reporter ask if Rove has received a target letter next week?