Non-compliant samples are samples that have not been handled or stored correctly. This can be the case, for example, when the maximum storage period has been exceeded, the samples have not been stored at the correct temperature, were delivered in unsuitable packaging, contain an incorrect amount of air, have been affected by heat, light, or moisture, have deteriorated chemically or microbiologically, have been cross-contaminated, were damaged during transport, or were delivered in insufficient quantities. Such deviations may affect the reliability of the analysis results.