Confirmatory sampling description

Once the samples to be analysed have been identified, physical descriptions, homogenization and sampling, presumptive testing, TEC and confirmatory testing should be undertaken. 

In order to determine that a controlled snbstance is present, it is freqnently necessary to carry ont a fnll forensic analysis of such samples. This includes a full physical description, sampling and snbseqnent chemical analysis, involving presnmptive tests, TLC and confirmatory techniques. 

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