Abstract: A tracking device captures biometric and other data for a sample matched to a patient from whom biometric data has been stored. The sample can proceed to subsequent steps only if there is identity between the captured biometric data and the stored biometric data. Where there is identity, a first processing operation is performed. A tracking device captures biometric data, other data concerning the sample and the first processing operation; the captured biometric data is compared with biometric data in the data repository. The sample can proceed only if there is identity between the captured biometric data and the stored biometric data; where there is identity, a further processing operation is performed. A tracking device captures biometric data, other data concerning the sample and the further processing operation; the captured biometric data is compared with biometric data in the data repository. These steps are repeated as many times as needed.