Randall Hopley, 47, was arrested near the B.C.-Alberta border in September 2011.
Hopley pleaded guilty to abducting Kienan Hebert and holding him in a cabin at a Bible camp before returning him unharmed four days later in the middle of the night to the home where he was abducted.
The former handyman has spent the last two years in protective custody in Kamloops and a psychiatric assessment to determine whether he should be declared a dangerous offender has been completed.
A loner with a long criminal record, Hopley had violently assaulted children before.
Crown lawyers are expected to argue Monday in B.C. Supreme Court in Cranbrook that Hopley should be declared a dangerous offender and given the most severe sentence in the Criminal Code — an indefinite prison term.
A week has been set aside for the hearing.