Foreign material testing in cannabis ensures product safety and quality by screening for unwanted substances that may contaminate the cannabis plants during cultivation, processing, storage, or transportation. Common contaminants include insect parts, hair, dirt, mold, rodent feces, manufacturing waste, metal fragments, wood, plastic, and parasites, all of which can pose health risks. Testing involves visual inspection and microscopic analysis to detect these materials according to current EP 2.8.2 procedure.