a few areas to look into i guess would be: - [there are a lot more, these are what i could think of off the top of my head]
* it is impossible to have a law that reflects the values, morals etc of every member of the community
* the balance between the rights afforded to the accused vs those that the victims have (looking into victims comp acts)
* concept that punishments/penalties are designed to fit in with the purposes of punishment - not always what society thinks is right
there is a heap of content within this question. my suggestion is grab a syllabus and highlight everything you think is relevant to the question and attack it that way.