a) that only deals with shoplifting and nothing else (read it again)
Are you an imbecile? From the link I just posted:
http://www.afp.gov.au/act/victims/citizens_powers_of_arrest.html
What exactly is a citizen's arrest?
A citizen's arrest is when you, as someone who is not a duly sworn police officer, detains a person because you believe on reasonable grounds that the other person is committing or has just committed an offence (for example, theft, assault, criminal damage).
b) that is ONLY aplicable in the ACT (you do realise you picked the smallest juristiction in the country dont you?)
But wait, didn't you previously claim that Australia didn't allow for citizen's arrest, full stop? :shrug:
And...
http://en.wikipedia.org/wiki/Citizen's_arrest#Australia
Citizen's arrest laws by country
[edit] Australia
The power to arrest is granted by both Federal and State legislation, however the exact power granted differs depending on jurisdiction. The power to arrest for a Federal offence is granted by s.3Z of the Crimes Act 1914.[1] Under the Act, a person who is not a police constable may, without warrant, arrest another person if they believe on reasonable grounds that:
the other person is committing or has just committed an indictable offence; and proceedings by summons against the other person would not: ensure the appearance of the person before a court in respect of the offence; prevent a repetition or continuation of the offence or the commission of another offence; prevent the concealment, loss or destruction of evidence relating to the offence; prevent harassment of, or interference with, a person who may be required to give evidence in proceedings in respect of the offence; prevent the fabrication of evidence in respect of the offence; or would not preserve the safety or welfare of the person.
A person who arrests another person must, as soon as practicable after the arrest, arrange for the other person, and any property found on the other person, to be delivered into the custody of a constable.