For this Act, an illicit drug or substance is any of the following:
(a) a drug or substance, the possession of which is prohibited under a law in force in the Territory;
(b) a drug or substance for which a prescription is required, if no prescription is in force in relation to the youth:
(i) in whose possession the drug or substance is found; or
(ii) in whose body the drug or substance is detected;
(c) in relation to a youth who is detained at a detention centre – a drug or substance, the possession of which is prohibited under the rules of the detention centre;
(d) in relation to a youth who is the subject of an alternative detention order – a drug or substance, the possession of which is prohibited under the conditions of the order.