According to VIC Law for the charge of Use of a drug of dependence,

Drugs, Poisons and Controlled Substances Act 1981 - SECT 75

Use of drug of dependence

75. Use of drug of dependence

A person who, without being authorized by or licensed under this Act or the regulations to do so uses or attempts to use a drug of dependence is guilty of an offence against this Act and liable-

(a) where the court is satisfied on the balance of probabilities that the offence was committed in relation to cannabis or tetrahydrocannabinol-to a penalty of not more than 5 penalty units; and

(b) in any other case-to a penalty of not more than 30 penalty units or to level 8 imprisonment (1 year maximum) or to both that penalty and imprisonment.

According to VIC Law for the charge of Use of a drug of dependence,
1 year / 30 penalty units

(a) The accused used or attempted to use a drug of dependence.

(a) Authorization or License.

(b) Duress.

(c) Factual dispute.

(d) Honest and reasonable mistake of belief.

(e) Identification dispute.

(f) Lack of intent.

(g) Mental impairment.

Magistrates' Court.