Searching for primary sources can be overwhelming - there are a lot out there! For the topic of crime and punishment, you might find a few different types helpful. Also remember that these primary sources were written by a certain person or organization, for a certain purpose; they are generally not objective accounts of the event. Below are some examples and how you might begin thinking about this concept:
Trial transcripts: Can give dates, names, and events surrounding the case. Can provide witness testimony - this testimony can reveal the morals, standards, or beliefs of the time or place in question. The person testifying might have felt threatened so lied or exaggerated; they may also be testifying against someone that they do not like. Keep this in mind as you read witness accounts.
Newspaper articles: Can give dates, names, and events surrounding a case. May be written in a sensational or exaggerated way to gain additional readership; thus, may only discuss the most shocking parts of a trial rather than the day-to-day facts, distorting the story.
Legal books or monographs: May be "prescriptive" - that is, the books tried to tell people how they should act, but this does not mean that people actually acted that way. Reflects what people in power wanted from citizen's behavior, what the legal and moral codes of the time were. May better reflect anxieties or threats to power, as those in power felt the need to create these laws to prevent some type of behavior.
... these are just a few examples of how to rethink these sources!
Some tips on searching for primary sources: