Audience: learners who have completed What courts do.
Learning goal: explain how the power to decide what enters the legal system shapes the system’s effects more than the laws themselves.
Not everything illegal gets prosecuted
Think about how many laws exist. Speed limits, tax codes, drug laws, building codes, environmental regulations, labor laws — thousands of rules at the federal, state, and local level. Now think about how many violations happen every day. People speed. Businesses cut corners. Tax returns contain errors. Building codes are ignored.
Most of these violations are never prosecuted. Not because they aren’t real violations, but because the legal system has limited resources and unlimited potential cases. Someone has to choose: which violations matter enough to pursue?
That someone is usually a prosecutor — a government attorney whose job is to bring charges. Prosecutors decide:
- Whether to charge someone at all
- What to charge them with (which laws to invoke)
- How to build the case (what evidence to present, what arguments to make)
- Whether to offer a deal (plea bargain) or go to trial
This power is called prosecutorial discretion, and it is the most important power in the American legal system — not because it is dramatic, but because it is structural. It determines which disputes enter the legal system and which ones stay outside it.
Discretion creates patterns
If a prosecutor’s office focuses on drug crimes, drug offenders fill the courts and prisons. If it focuses on financial fraud, white-collar defendants fill the dockets. The same set of laws, applied with different priorities, produces completely different outcomes.
These patterns aren’t random. They reflect:
- Resources: What the prosecutor’s office has the staff and budget to pursue
- Politics: What elected officials and the public demand attention to
- Visibility: What kinds of violations are easy to detect and document
- Institutional relationships: Which law enforcement agencies bring cases to the prosecutor
The visibility point connects directly to what we learned about rules and categories. Communities that are heavily monitored — through policing, surveillance, documentation requirements — produce more visible violations. Communities that are less monitored produce fewer visible violations. This doesn’t mean they have fewer violations. It means the legal system sees fewer of them.
The result: prosecutorial discretion, which sounds like a neutral power to allocate resources, actually determines whose lives are subject to legal formatting and whose aren’t.
The evidence choice
Within a case, prosecutors also choose what evidence to present. This is a second layer of discretion that shapes what the court sees.
Remember from the last lesson: courts see evidence, not reality. The prosecutor decides which pieces of evidence to gather, which witnesses to call, and which facts to emphasize. The defense does the same. Between the two of them, they construct the version of reality the court will evaluate.
This means the prosecutor’s evidence choices shape not just the outcome of the case but the legal record — the court-produced facts that will propagate through the system. When a prosecutor presents an institution’s community programs as evidence of good faith, that choice creates a new legal fact: “community programs are evidence of good faith.” Future prosecutors and defense attorneys will reference this. The evidence choice becomes a template.
This is how individual prosecutorial decisions produce structural effects. A prosecutor choosing to present zine production as evidence of institutional character is making a practical decision — it helps the case. But the structural consequence is that zine production becomes a legal credential, incentivizing institutions across the sector to adopt it.
Judges and juries
Prosecutors aren’t the only decision-makers. Judges decide:
- What evidence is admissible
- How the law applies to the facts
- What the sentence is (in many cases)
Juries decide:
- Whether the facts, as presented, satisfy the legal standard (guilty/not guilty, liable/not liable)
But judges and juries work with what prosecutors and defense attorneys give them. They evaluate the translated, evidence-based version of reality that the parties construct. Their power is real but bounded by the choices made before they enter the picture.
This is why prosecutorial discretion matters more than it might seem. The prosecutor sets the terms of the entire proceeding — what is charged, what evidence is presented, what legal framework applies. Everyone else works within those terms.
Power is structural, not personal
It is tempting to think of prosecutorial power as personal — a specific prosecutor making a specific choice. And individual choices do matter. But the larger point is structural: the legal system is designed to concentrate the power of initiation in prosecutors. This isn’t an accident or a corruption. It is the system’s architecture.
The system could be designed differently. In some countries, judges investigate cases themselves (inquisitorial systems). In some legal traditions, community bodies rather than individual prosecutors decide what to pursue. The American choice — adversarial procedure with prosecutorial discretion — is one design among many, and it produces specific structural effects: it concentrates the power to determine whose conflicts enter the legal system in the hands of a small number of government attorneys.
Understanding this is essential for everything that follows. When we analyze how legal proceedings reshape cultural practices, institutional behavior, and community life, we are analyzing the consequences of this structural concentration of power.
Check your understanding
1. Why does prosecutorial discretion matter more than the laws themselves?
Because laws only affect people whose violations are prosecuted. With thousands of laws and limited resources, most violations are never charged. The prosecutor’s choices about what to pursue determine whose lives are subject to legal formatting. Two identical legal codes, applied with different prosecutorial priorities, produce completely different social outcomes.
2. How do evidence choices create structural effects beyond the individual case?
When a prosecutor presents a certain type of evidence (like community programs as proof of good faith), the court’s acceptance of that evidence creates a legal precedent. Future attorneys reference it. Institutions that become aware of it adjust their behavior. The prosecutor’s practical choice — what evidence helps this case — becomes a template that shapes institutional behavior across the sector.
3. Imagine a reform-minded prosecutor takes office and pledges to use discretion more equitably. She changes charging priorities, diversifies the cases she pursues, and avoids using community practices as character evidence. Has she solved the structural problem this lesson describes? Why or why not?
She has not solved the structural problem. She has made better individual choices within a system that still concentrates the power of initiation in prosecutors. When she leaves office, her successor can reverse every priority. The system’s architecture — which gives prosecutors the power to determine what enters the legal system — remains unchanged. The concentration of that power is a design feature, not a personnel problem. Structural power produces effects regardless of who holds the office; addressing it requires changing the system’s architecture, not replacing the people who operate within it.
What comes next
The next lesson, Rules change behavior, brings together everything from this introductory track: how rules create categories, courts translate disputes, and prosecutorial choices shape the system — to show how law changes behavior even for people who never enter a courtroom.