Can a grand jury target offer evidence of his or her own?
For the most part, the subject of a grand jury investigation has no right to testify unless subpoenaed, nor any right to compel the grand jury to hear certain witnesses or evidence.
Often, however, if a target requests an opportunity to testify, he or she will be permitted by the prosecutor to do so but without a grant of immunity.
The prosecutor may refuse to present evidence submitted by a target. In federal grand juries, exculpatory evidence need not be presented, although in many states exculpatory evidence must be submitted for the grand jury's consideration. Prosecutors have the right in federal grand juries to introduce hearsay and to otherwise utilize evidence that would not be admissible in a regular trial
from
http://www.abanet.org/media/faqjury.html
As I've noted before ONLY the prosecutor presents evidence.
A defense attorney may not offer evidence or cross examine any witnesses.