Control

Material of established origin used to evaluate the performance of a test or comparison. Or A test performed to demonstrate that a test method works correctly and to ensure that data are valid. Positive controls confirm that the procedure will produce the expected result. Negative controls confirm that the procedure does not produce an unintended result.

Also referenced in ANSI/ASB 017 Standard Practices for Measurement Traceability in Forensic Toxicology, 
ANSI/Academy Standards Board (ASB), Crime Scene/Death Investigation - Dogs and Sensors - Terms and Definitions, ANSI/ASB 056 Standard for Evaluation of Measurement Uncertainty in Forensic Toxicology ANSI/ASB 046 Wildlife Forensics Validation Standards—STR Analysis.