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.
Answer:
I just want to be able to make it tomorrow
You need to tell him that he needs to be experienced to do this. your responsibility is honesty and if he wants to do this then he should do it himself
