DfI/2019-0314: FOI Request for the policy that states that jewellery is prohibited in the Theory test exam

This is a request relating to a complaint I have against staff members in Pearson Ballymena, after being asked to remove my cross necklace before my Theory test. I would like to ask for the policy that states that jewellery is prohibited in the exam as I never read on any policy about the removal of jewellery.