NEWARK, Del.--(BUSINESS WIRE)--Strategic Diagnostics Inc. (NASDAQ: SDIX), a leading provider of biotechnology-based detection solutions for food safety and life science applications, today announced that its recently improved RapidChek® E. coli O157 (including H7) System has earned Performance-Tested MethodsSM certification from the AOAC Research Institute (License Number # 070801) for testing composite samples of raw beef including ground beef and boneless beef trim.