The correct answer is Drug use. Obviously a person using a drug to get someone better or to make someones life a bit more stable.
It can not be drug abuse as it is using the drug for just casual purposes which infacts harms the other person.
Also, it can not be addiction as that is when the person is addicted to the drug and he or she has no motive of medication or something and just uses it for the sake of it.
Answer:
Wash their hands.
Explanation:
When employees are asked to use chemicals for cleaning, they should always be sure to wash their hands. This is because, havig chemicals on your hands could cause harm to yourself or other people, especially if you are in contact with customers.