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i have contaminate the food by putting my dirty hand on the food.
If it gets into food yes! It is poisonous.
Two reasons: your food could contaminate your experiment, and the experiment could contaminate your food.
Yes
pests contaminate food by landing on the food and leaving there waste ,if you may, like flies whenever they land they vomit, leave waste, and urine. pests also contaminate food just by carrying diseases.
through organisms which contaminate food like house fly
Chemicals in the lab might contaminate the food - causing poisoning. The food might contaminate an experiment - making the results invalid.
cross contamination
Some behaviors that can contaminate food include toileting, not washing hands, chewing fingernails, picking nose, bad body odor, and scratching face or behind.
Because saliva contains bacteria from your mouth.
Contaminate
Yes a person who ate prion infected food using hands can cross-contaminate other things if he touches the food infected with prions with his hands.