Arrested for possession of concentrated cannabis I had a valid medical card at the time.

Hire an experienced marijuna attorney. I have done med MJ law for quite some time, and some courts are still trying to say that hash isn't covered...

The police don't need parental permission to investigate alleged underaged drinking.

I received a summons for a DUI. On the report they list an incorrect registration date for my vehicle. Could this benefit me?

No. The registration date is irrelevant to DUI.

What is the likely hood of authorities making a 17 year old go back home?

If discovered, the minor will be forced back to the legal guardian.

No, they don't need to have chemical tests to charge and convict you.

I was assaulted twice at my work place and they did do anything about it. Know when i say assaulted i was pushed in my back.

You can file a police report. Hopefully you did that at the time.

How can I legally stop going to public school at the age of 15?

Try posting this in the family law forum. This isn't a criminal law issue - except for the person who got you pregnant - he needs a lawyer.

If I have a felony charge from my juvenile years sealed, will this prevent me from owning a firearm?

It's the federal government, not Indiana you need to be worried about. Contact a lawyer to see if Indiana expungements qualify for federal firearms...

Im in NE i was drunk was not driveing i flipd off a cop he pulled me over an gave me a disordlely conduct charge is that real

Yes. It is real. Get a lawyer. Flipping off cops is plain stupid.

If you recieved a traffic ticket as a juvenille and it has been 10+ years can they still pull your liscense over it or warrant?

No. There is not. They filed the ticket, you ignored it. Things don't disappear with time, they get worse.