INDIANAPOLIS — When is a confession to murder not enough to take an admitted killer to trial? When a judge rules the suspect should never have been taken into custody in the first place. That’s the dilemma Alicia Harden faces in solving the murder of her son in February of 2020. It was just a few weeks before the COVID pandemic swept the world and police think 20-year-old Jeremiah Harden was in the 5000 block of Eagles Watch Drive to do a mariju…