| http://www.w3.org/ns/prov#value | - (a) prosecutorial overreaching, through threats, harassment, or other forms of intimidation, has effectively forced the witness to invoke the Fifth Amendment, or the prosecutor has engaged in discriminatory use of immunity grants to gain a tactical advantage; (b) the witness's testimony is also material, exculpatory, and not cumulative; and (c) the defendant has no other way to obtain the evidence
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