Can i beat a false identification to law enforcement charge?

January 16, 2015
the state police showed up to my house looking for a previous tenant. they knew my first name was john but i lied to them about my last name. they were not looking for me but a guy named cory. i invited them into my house and tried to help them. i had warrant for failure to pay fines. they ran the name i gave them and it didnt show up on a computer. i finally gave them my real name and tey said if i helped them they would not file charges. well they filed charges. is this a serious offense and if it is will i go to jail? i have a bad check and theft by deception from 1994 and 2 dui 8 years ago.

What county did this happen in?