George Clarke was a San Diego County Deputy District Attorney who served as a prosecutor and conducted the direct examination of Dr. Robin Cotton from May 8 through May 11, 1995. He also conducted redirect examinations on May 10 and May 15. On August 3 and 4, he cross-examined defense DNA expert Dr. John Gerdes about laboratory practices and contamination, including the fact that multiple independent laboratories obtained DNA matches despite not using the disputed Yamauchi extraction process.