In a Laboratory Composite multiple samples are taken within a property but they are all kept, and sent to the laboratory, individually for analysis. The laboratory will take an extraction from each test tube and combine them into a single analysis. The result shows the maximum level of methamphetamine that could be present on a single swab and also provides an average level of contamination across all swabs.
– One sample taken in every “high use” area in accordance with NZS8510:2017
– As the samples are all kept separate, if contamination is found they can be re-analysed individually to ascertain which sampling location holds the contamination.
Note: Re-analysis is an additional cost per test tube
– As samples are taken and kept individually, the sample collection takes longer and stricter cross-contamination practices must be enforced which increases the cost.