What Nobody Teaches You Before You Make Sergeant

You were promoted because you were good at a job you are no longer doing. Nobody mentions that at the ceremony.

• In states that mandate supervisor training, you can run a squad for a full year before you get it.
• Almost nobody has tested whether police promotion selects for supervisory ability. What validation exists predates 1990, and it is not encouraging.
• Fairness and high standards are not opposites. The evidence says accountability depends on fairness to land.

The training arrives after the job does

One state requires an 80-hour supervisory course within twelve months of promotion. Another requires a 32-hour new supervisor course, which its rule says must be completed “within one year prior to or one year after appointment as a supervisor.”²

Read that again. A sergeant can supervise people for twelve months before anyone teaches them how.

And those are only two of the states with a rule — there is no national count of how many have one, and no national standard. The body that writes model minimum standards for state commissions has no model standard for first-line supervisor training. Federal statistics collect in-service training hours for sworn personnel and publish nothing supervisor-specific.

A national policing association put it plainly in a report devoted to the problem: “When new sergeants are finally chosen, there is no uniform system for training them. In many cases, they are thrown into the deep end of the pool and told to swim.”³

Roughly 50,000 sergeants supervise more than 650,000 officers — about 85% of the entire law enforcement workforce reports to one.³

Nobody has checked whether promotion works

A 2024 expert review of police promotion practice found the process “lacks uniformity across agencies, and there is a dearth of research on the most-effective ways.” On using performance evaluations as a criterion, it was blunter: evaluation processes are “inadequate, inconsistent, and inequitable.”⁴

We looked for studies testing whether any promotion method predicts how good a supervisor someone turns out to be. We found almost nothing. Two follow-up validations of promotional assessment centres, both small and both from the 1980s. Nothing modern, and nothing at all on written exams or oral boards — the two methods most agencies actually use. The 2024 review says it plainly: there is “a lack of longitudinal and follow-up research with people who have gone through the promotion process and served in leadership roles.”⁴

A participant in that association’s national meeting described the result: “We promote technicians, and then we put technicians out in the field and expect them to lead... Not a super technician, not a super cop, but someone who is interested in leading...”³

The workload is real too. That association’s member agencies reported officer-to-sergeant ratios from 4:1 to 15:1, averaging about 7:1, against a stated preference for 6:1.³ One sergeant described the mechanism exactly: “With 10, I hardly spent any time on the street. Give me six officers and I can get my paperwork done but also spend time with the officers.”

The four things your officers are actually judging

The strongest evidence base in police supervision is on internal organizational justice — how officers feel treated by their own department. A meta-analysis of criminal justice employees pooled 1,924 effect estimates from 143 studies covering more than 70,000 people across 17 countries, and found a consistent, sizeable relationship between organizational justice and employee outcomes.⁵

Underneath that sits a study of 510 deputies with an 85% response rate, which measured supervisor procedural justice with four items. They are worth reading as a job description:⁶

In that study, supervisor procedural injustice was more strongly related to officers losing trust in their agency than the officers’ own sense of their authority.⁶

And the effects reach past attitude. In a survey of one department with a 99% response rate and 483 officers in the analysis, measured against official records rather than self-report, officers who perceived their organization as fairer were significantly more likely to have zero citizen complaints, zero internal investigations and zero disciplinary charges.⁷ That is cross-sectional, so causation runs both ways — officers who have been disciplined may well judge the organization harshly because of it.

High standards and support are not opposites

This article refuses the choice the profession keeps setting up: old-school discipline on one side, soft leadership on the other. The evidence says the framing is wrong, and it says so precisely.

Perceived fairness was associated with less negative work behaviour among every group of officers. But the effect was 41% stronger among officers who had actually been through the disciplinary process than among those who never had.⁸

Fairness is not what you offer instead of accountability. It is what makes accountability land. The officer you had to discipline is exactly the officer for whom being treated fairly matters most.

The reverse holds too. In interviews with officers who actually resigned, one described being punished for challenging a colleague’s poor work: “I got told I was cruel by my inspector, ‘cause I fronted somebody out about their poor work record.” Officers in that study cited unchallenged poor performance among colleagues as a reason for leaving.⁹

Officers in that study described low standards, not high ones, as a reason they left. Every supervisor who lets a weak performer slide is making a retention decision about everybody else on the shift.

Being honest about what we know

You will read a lot of confident writing about supervisors and retention. Most of it rests on a slogan.

“People don’t leave jobs, they leave managers” is usually supported by a statistic that managers account for around 70% of the variance in employee engagement scores. That is an engagement figure, not a turnover figure, and Gallup has never published the underlying analysis.

The defensible version is narrower and still worth having. Across 316 studies of actual voluntary departures, leadership correlated about −0.24 with turnover across 42 samples — a real, moderate relationship, one predictor among many, and measured outside policing.¹⁰ Meanwhile, in the largest single-agency police study of turnover intention we found, treatment by management dropped out entirely once pay and work-life balance were accounted for.¹¹

One more thing worth knowing. The foundational study of police supervisory styles — the one still cited as the reference — is built on field observation conducted in 1996 and 1997.¹² Thirty years on, it is still the best we have. That is the actual state of the science on the job 85% of the workforce reports to.

That study also found something inconvenient. The most engaged, lead-from-the-front supervisors produced the most proactive officers and officers twice as likely to use force. Presence changes behaviour. It does not automatically change it for the better, which is the entire argument for training people before you hand them a squad.