Which of the following is not a source of discovery obligations in criminal cases?

In the context of criminal cases, discovery obligations are derived from various legal sources, including the Constitution, statutes, and rules specific to criminal procedure. Common law, while historically important to the development of legal principles, does not serve as a formal source of discovery obligations in the same way that the Constitution and statutes do.

The Constitution mandates certain rights that affect discovery, such as the right to a fair trial, which influences what evidence must be disclosed. Statutory laws establish specific procedural requirements for discovery in criminal cases, detailing what information must be shared between the prosecution and defense. Additionally, procedural rules created by courts govern the logistics and timelines of discovery processes.

Since common law does not specifically set out discovery obligations and instead relies on judicial interpretations and precedent, it is not considered a formal source of discovery obligations in criminal cases. Thus, identifying common law as the correct answer highlights the distinction between various sources of legal requirements in criminal procedure.