By Jackson Perry
When the public hears about NFL player misconduct, the conversation usually begins at the end of the story. A headline. A booking photo. A police report. At this point the questions are familiar. Was there an arrest? Did the player violate league policy? Should the team or league discipline him? What consequence would fit the incident and the player’s history?
These are reasonable questions. The culture around professional football brings together public reputation, conduct policies, and legal outcomes. But when the conversation starts only after an incident becomes public, the frame can miss the broader context. It focuses on what should happen to the player now, while paying less attention to what may have existed before that moment.
Head injury exposure and physical contact are built into football, alongside a culture where injury has long been treated as part of the job. That does not mean head injury explains misconduct. It does mean head injury belongs in the conversation. If we talk about player welfare when a player is injured on Sunday, but only talk about discipline when a player is arrested later, then we may be separating two conversations that deserve to be closer together.
That concern shaped a study I recently published with Kimberly Kras and Burrel Vann Jr. in Deviant Behavior. The article, “Headstrong, Flagged Later: Concussions and Arrest Risk Among NFL Players,” examined whether documented concussion history among NFL players was associated with later booking-based arrest. The study was not intended to prove that concussions cause arrest or any other adverse outcome; the data cannot show that. The goal was narrower: to assess whether documented head injury is associated with criminal justice contact in a population exposed to repeated head-impact risk. The larger question is whether professional football has built enough support for the behavioral, emotional, and social problems that can follow head injury over time.
The study used publicly available data on NFL players who appeared in at least one regular-season game from 2010 through 2020. The final analytic sample included 6,201 players. We linked documented concussion history from public NFL injury reports with booking-based arrest records covering 2010 through 2024. Arrest here means booking-based arrest, not conviction, guilt, or a complete measure of offending. Violent arrest was examined separately as a secondary outcome.
In the main unadjusted analysis, players with documented concussions had higher odds of booking-based arrest than players without documented concussions. The difference was not large in absolute terms. Among players without a documented concussion, 5.2 percent had an arrest. Among players with a documented concussion, 7.6 percent had an arrest. In odds-ratio terms, that translated to roughly 50 percent higher odds of booking-based arrest among players with documented concussions.
The timing results make that caution even more important. When arrests were limited to events through 2020, the positive association remained. But when we used a stricter test that excluded cases where a player’s earliest arrest came before his earliest documented NFL concussion, the association weakened and was no longer statistically significant. The violent-arrest findings also require restraint. They moved in the same direction but did not reach statistical significance. For that reason, the study should be read as preliminary evidence of an association, not causal proof.
Public NFL data also do not consistently capture several factors that could matter: pre-NFL criminal justice contact, socioeconomic background, and other life course experiences. Any of these could shape the relationship between concussion history and arrest. Without those measures, the study cannot rule out alternative explanations.
The study raises a practical question for professional sports. If head injury can affect sleep, mood, impulse control, or emotional regulation for some players, then support cannot stop at the return-to-play decision. A player’s health does not stop mattering when he clears protocol. It does not stop mattering when he comes off the injury report. It does not stop mattering when he leaves the league.
This is where sports law and player welfare meet. The concussion debate has understandably focused on return-to-play. No player should return to competition before it is safe. But return-to-play is only one part of the problem. A sport that creates foreseeable exposure to head impacts also has to ask what responsibility looks like after the immediate injury window closes.
For lawyers, policymakers, unions, leagues, and teams, the harder question is not only whether the protocol was followed on game day. It is what duty of care should look like across a player’s career and after it ends. That does not mean every later behavioral problem can be traced back to football. It does not mean concussion history explains criminal justice contact on its own. But it does mean that treating brain injury as a short-term sports medicine issue understates the risk an organization is already managing.
The consequences may extend beyond missed games.
A player-welfare approach would move the focus from blame alone to detection, treatment, and continuity of care. That means honest education about what post-concussion symptoms can look like. It means real access to neuropsychological and mental health services. It means follow-up for players who report changes in sleep, mood, impulse control, or emotional regulation. It also means making sure players know where to turn when problems appear after the immediate injury window has passed.
Future research should use stronger longitudinal designs, fuller measures of life-course head injury, and better information on player background, position, prior criminal justice contact, and post-career health. It should also account for changes in concussion protocols and injury reporting, because what appears in the data may partly reflect what teams and medical systems were able or required to document at the time.
But sports organizations do not need perfect data before improving support. The existing evidence is strong enough to justify treating head injury as part of player welfare, not only sports medicine. A player who experiences emotional or behavioral changes after head injury should not be left to manage them alone, especially in a sport where head impacts are a known occupational risk.
This matters because public conversations about NFL arrests often move quickly toward punishment and character judgment. Discipline has its place. Sometimes it is appropriate. But when discipline becomes the only response, leagues and teams may miss earlier opportunities for prevention, treatment, and support. A more complete response asks what happened after a legal incident, but also whether there were health-related warning signs before it.
For professional football, the takeaway is practical. Head injury belongs in player welfare conversations beyond the sideline and beyond the active roster. If leagues, teams, unions, and medical professionals take concussion risk seriously on game day, they should also take seriously the possibility that some effects may appear later, in less visible ways.
The goal is not to label players by their injury histories. It is to build support systems that recognize how head injury can affect players beyond the injury report. That requires better research, more careful public discussion, and stronger long-term care. Professional football has made real progress in identifying and managing concussion risk. The harder work is asking what comes after: after the injury is documented, after the player returns to play, and after the career ends.
Full study: Jackson Perry, Kimberly Kras, and Burrel Vann Jr., “Headstrong, Flagged Later: Concussions and Arrest Risk Among NFL Players,” Deviant Behavior. https://doi.org/10.1080/01639625.2026.2673400
