If there are poisonous or toxic materials near the food or in the vicinity of food then the food must be thrown away or disposed of and the facility must be cleaned and sanitized and the poison or toxic materials are to be disposed of and replaced.
According to the Red Cross, people who have tattoos can donate blood. It's just that they would have to wait for 5 or 6 months after getting a tattoo before donating their blood. Same thing if you get your ears pierced.
