On questions like these regarding ethical issues, you should consider both the for and against arguments. Your ending conclusion does not matter as long as you show that you’ve considered both sides of the argument. For example, you could say that it’s not right because it is an invasion of privacy and that the drugs aren’t used intentionally to enhance performance or to lead to bias like in athletic competition. However it can be appropriate because use of drugs is illegal. The use of it can lead to dangers to one’s wellbeing and since it occurred at work where machinery might be in use, the workplace can be taken to be responsible for failing to take care of employees. And then conclude it with whether you feel it is right or wrong.
There is a chance that the person receiving that insulin will get a bad immune response, and there is a possibility that the animal might have a disease or infectious organisms, that their insulin might contain, and putting it inside a human might transmit that disease.
