Question about Lic?

I was reading a thread on here this morning and someone brought something up that made me think? What happens when someone comes into Indiana and buy's a buck tag for say gun season. Then he goes out and kills a doe and tags it. Not knowing he can't do that. Whenever I tag a deer other people are taging them and it seems they just ask the usual questions like buck? doe? time? lic #? Name ect.... Maybe I'm missing something but just thought I would ask. Where I hunt there are a lot of people coming to hunt from Ill and I know a few hunters from Mich. I know not knowing the rules is no excuse but if they tag a doe and leave what happens to them?

Thanks!

Hopefully you can understand what I am asking!!! lol