The Government is "confident" authoritative institutions in Northern Ireland, like the police, are independent.
Speaking to Good Morning Britain, the Northern Ireland Secretary dismissed calls from the son of disappeared Jean McConville to have her murder investigated by an independent body.
Theresa Villiers explained: "I am confident that the current institutions in Northern Ireland, the police service of Northern Ireland, and other institutions are independent. They will make fair and balanced decisions on this case, as they do in all others."
Adams attacks reasons for his detention and denies McConville murder
It is claimed IRA volunteers described what happened the night Jean McConville was murdered to Boston College's "Belfast Project".