You'll easily end up in jail but celebrities will still be free because it's the fame, status, money that protects them from everything. Imagine Lionel Messi decided to use drugs, do you really believe that any government ever arrest him? Can you imagine what would happen in the world if any police force arrest him?
I think it will depends on where you live and the independency of the court, there's no way you can bribe an independent and professional judge, but if you live in a corrupted country and the judges isn't professional, you can escape from the punishment.
Messi, Elon Musk and any other celebrities can get jailed, I don't think if Messi get jailed, you and other Messi's fans will attack the judges or will try to defend him.
Wearing the signature on this forum to me looks like wearing a company's t-shirt in public. How can anyone arrest me if I wear some company's logo and url? Even if I print amphetamine logo on my t-shirt and paint a tattoo on my face, I think I'm safe.
Are you sure? will you try to wear anything with black color and carrying a big bag outside? I'm completely sure anyone will stay away from you and they might call cops since you're seems like a terrorist.