I was recently booked for wearing an illegal helmet.. It had an aust standard sticker on the helmet, but no sewn in patch inside. What are the Victorian motorcycle helmet laws? Do I have a case to argue this matter in Traffic Law court?
Unfortunately, the police can fine you (or remove demerit points) for riding with a helmet that does not comply with standards: VicRoads.
Each State and Territory has their own, slightly different, motorcycle helmet laws and standards. A helmet that is legal in NSW will not be legal in Victoria, for example. Helmets purchase overseas also generally do not meet Australian standards.
Apparently, according to the Victorian Motorcycle Council, Victoria and the Commonwealth Health Standards have helmet standards that are impossible to meet and have not yet (as of 2013) been met by any product on the Australian market. The submission specifically mentions that although consumers take stickers of compliance to mean actual compliance with legal standards, this is not the legal position. I would suggest bringing this submission up with the police and asking whether any helmets have been held to meet conflicting (Victorian and Commonwealth) standards: Council submission on helmets. You can try contacting the Victorian Motorcycle Council and see if the situation has changed since the submission.
You may also complain about the compliance sticker. You may lodge a complaint with the Australian Competition and Consumer Commission. There is a consumer guarantee under the Australian Consumer Law (came into effect in 2011) that provides that products must match their descriptions, of acceptable quality and meet any promises in relation to standards/quality/performance that it sets out: ACCC consumer guarantees. You should try contacting the company who sold you the helmet first and see if they are able to give you a refund/compensation for your fine.