Pesticides are chemical substances used to control pests, while mycotoxins are toxic compounds produced by certain fungi that can contaminate crops and food products. For example, pathogenic species of fungi can produce toxic mycotoxins, such as aflatoxins and ochratoxins.

The screening process involves sample preparation, extraction of the target compounds, and analysis using liquid chromatography coupled with mass spectrometry. This technique allows for the identification and quantification of specific pesticides and mycotoxins present in the sample at trace levels.

Pesticide and mycotoxin screening is essential for ensuring the quality of cannabis products and food items. Regulatory authorities set action levels for pesticides and mycotoxins in cannabis products to protect consumers from potential health risks. Regular screening helps to monitor and enforce compliance with these regulations.