The Utah County Attorney has confirmed ... the Lehi Police Department has completed their felony bigamy investigation into Kody Brown and his gigantic family -- and the case has been turned over to the Utah County Attorney ... who will ultimately decide whether or not to charge the family with a crime.
In Utah, bigamy can get you 5 years in prison ... though it's rarely prosecuted.
Kody Brown -- who has 3 wives, a fiancée and 13 children -- claims he was aware of the risk he was taking when he decided to put his family on the TLC reality show ... but insists it was a "risk worth taking."