CTI provides drug/health product physical and chemical analysis services related to quality control samples, which are mainly used for method verification and validation, quality assurance of the testing process, etc., and can be used for blind samples for on-site review, supervisory review, re-evaluation and unannounced inspections of regulatory agencies. It can also be used for internal audit, daily quality supervision, quality assessment, personnel assessment, method comparison, personnel comparison, equipment comparison, etc. accused samples or blind samples.