AS you have shared with me make sure sure that you know what one is talking about. The term environmental contamination," is badly misused here
You are alleging that someone’s “dirty hands,” or “human urine in stall bedding,” is an environmental
contaminant leading to a sample’s environmental contamination. Legally and the federal follows the EPA’s guidance on what constitutes an environmental contaminant and “environmental contamination” Environmental contaminants are collected from samples that might be air (aerosol), water, surface (such as building materials), and soil and not from a person with sloppy habits that leaves filth/residue on their work surface… Also, environmental contamination “ requires following special sampling protocols, handling, and analytical procedures” and does account for every contaminant found in the sample. If you believe the drug present in the sample is due to environmental contamination, if you don’t even know the source of the contamination. That is when we can use the “cross-contamination” of a sample. It is clear that individuals here have little experience in the analytical in identification of “environmental contamination of samples or products.