Its a class H FELONY in NC--you get a felony record if convicted. Probably a hefty fine and community service--but if you bring a lot of dirty linen you could get jail time
Plus your parent can be zapped with the costs of all the economic damages the school suffered.
I am rather suprised that Mom could get you out with a mere signature I thought folks in NC took bomb threats a bit more serious than to let folks out on bond with a mere signature.
Unless you have a existing IEP, I don't buy the bipolar stuff and I doubt anybody else will either . And I don't buy an IEP as having weight outside of internal school issues either.
You are going to need a lot more craft to be able to show you lacked the mental capacity to formulate illegal intent at that moment---I suspect you better line up and pay one of your countys better criminal defense lawyers pronto and plan to spring for some very expensive expert testimony.
A felony on your record could keep you out of many a decent job!
Were I back in my personnel days I'd put your application into trash if you had a conviction along the lines you post above.
At age 17 I doubt this is a matter for juvy--but you can ask counsel.