My question involves criminal law for the state of: South Carolina
I am 19 years old and I was at my brothers party *he is 21* this past Halloween and I must admit that I was pretty drunk but definitely not obvious. We were on his back porch when 3-5 older guys walked up like they were joining the party and asked us all to show them ID. I said I didn't have mine and when they asked my age I told them 21, later admitting that I was 19. I got a MIP ticket but I kept quiet pretty much the entire time and only answered my name, address etc. Now here are my questions:
1. The cops (undercover agents) didn't ask permission to come onto the property. Does this matter?
2. I was sitting down when they walked up and stayed this way until they left and my face was all painted up so it showed no red faced signs of being drunk and they couldn't smell my breath. I had no alcohol in my hands or anywhere within arms reach of me for that matter. The cops did not ask me if I had been drinking, they did not perform a field sobriety test, I was not slurring my speech or acting obnoxious, and they didn't make me blow into a breathalyzer so they had no proof at all that I had been drinking and no evidence to support it which is why i kept quiet and cooperated after I admitted my age. I suppose that the reason for my ticket was that I was in fact 19 and they just assumed that I had been drinking but is that enough to give someone a ticket? Does this have any significance to my case?
3. The cop spelled my last name wrong on the ticket. We'lll say that my last name is... "Baldwin" he spelled it "Balwin." *This is not my last name*
4. I've already completed PTI for possession of marijuana can I still complete ADP?
Any and all help will be greatly appreciated! I'm kind of in a jam but I think if I want to fight it I have a decent chance..?

