Define probable cause and beyond a reasonable doubt using class readings as a s

Define probable cause and beyond a reasonable doubt using class readings as a source or other source(s) you may have identified.
What role do each of these concepts play in the judicial system? Use examples to support your discussion of their role in the judicial system.
For example, after defining probable cause, explain what types of processes rely on that level of proof to move an investigation forward. What happens if an investigator cannot reach the threshold of probable cause, what steps can the investigator no longer take during their investigation? If an investigator is able to articulate probable cause, how does that help their investigation move forward?