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Appellant McCowen Brief - Mass Cases

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juvenile, probation, arrest and criminal records of all<br />

Commonwealth witnesses; all information pertinent to<br />

scientific tests; for other suspects; and for discovery<br />

regarding alleged witnesses. App. 13, 578, 583. After<br />

discovery conferences on February 10, April 7, and<br />

October 11, 2006, the Commonwealth filed a Discovery<br />

Compliance Certificate, knowingly withholding<br />

specifically requested evidence. App. 23.<br />

<strong>McCowen</strong> was not obligated to independently unearth<br />

material he requested. The State must disclose all data it<br />

possesses and all information possessed by persons<br />

"subject to the prosecutor's control." Commonwealth v.<br />

Martin, 427 <strong>Mass</strong>. 816, 824 (1998) (Prosecutor must<br />

disclose "information in possession of a person who has<br />

participated in the investigation or evaluation-and has<br />

reported to the prosecutor's office...") ; Commonwealth v.<br />

Xucceri, 412 <strong>Mass</strong>. 401, 412 (1992); Commonwealth v. Neal,<br />

392 <strong>Mass</strong>. 1, 8 (1984). A defendant must be granted a new<br />

trial when the Commonwealth doesn't disclose evidence<br />

favorable to the accused that may have altered the<br />

verdict. Brady v. Maryland, 373 U.S. 83, 87-B (1963).<br />

Forty-five years ago, the United States Supreme Court<br />

defined the standard the government must foltlow with<br />

regard to disclosure of exculpatory evidence. Id. The<br />

Brady Court concluded that the goal of the criminal<br />

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