EL DORADO COUNTY, Calif. —
A national debate over how police question juveniles has acquired a new piece of evidence, and it could be particularly relevant to communities such as El Dorado County where law enforcement routinely works with young suspects, victims and witnesses.
New research by Scott M. Mourtgos and Ian T. Adams examined whether laws restricting deceptive interrogation tactics actually make it harder for police to solve crimes involving juveniles.
Their answer, based on the data examined, is no.
But there is an important California caveat.
The study does not measure the effect of California’s juvenile-interrogation law on El Dorado County cases. The researchers’ current preprint identifies seven states that enacted the restrictions examined in the study between 2022 and 2024: Illinois, Oregon, Utah, Delaware, Nevada, Indiana and Colorado.
A public summary posted by Mourtgos on Aug. 22 describes the project as involving nine states, creating a discrepancy between the public summary and the current preprint. Until that difference is resolved in the final publication, the seven-state figure in the methodology is the more defensible number for reporting the study’s actual statistical sample.
What the research found
The researchers examined 510,582 juvenile-involved incidents reported through the FBI’s National Incident-Based Reporting System between 2021 and 2024.
The analysis concentrated on serious offenses, including aggravated assault, robbery, burglary, motor-vehicle theft, kidnapping, murder and specified sex offenses. Researchers were looking for evidence that restrictions on deceptive interrogation caused police to clear fewer cases.
They did not find it.
The study’s primary finding was that arrest clearance rates did not decline after the restrictions took effect. Depending on the statistical method used, the estimates were either essentially neutral or modestly positive. Multiple additional tests produced the same general result.
One analysis estimated an increase of about 1.82 percentage points in arrest clearance, while a separate analysis limited to agencies reporting consistently throughout the study period produced an estimated increase of 3.08 percentage points. The researchers caution, however, that these positive estimates should not be interpreted as proof that banning deceptive interrogation actually improves police clearance rates. Their conclusion is more restrained: the expected decline did not appear in the data.
That distinction matters.
The study does not demonstrate that restricting interrogation deception makes police more effective. It demonstrates that researchers could not identify the anticipated systemwide loss in case resolution.
What California already prohibits
California has already taken a comparatively restrictive approach.
Assembly Bill 2644 added Welfare and Institutions Code section 625.7, prohibiting specified interrogation practices when law enforcement questions a minor in custody about a felony or misdemeanor.
Under California law, officers may not employ threats, physical harm, deception or psychologically manipulative interrogation tactics under the circumstances covered by the statute. The law specifically addresses practices including the knowing communication of false facts about evidence, misrepresenting the accuracy of evidence, false statements about leniency, minimization, maximization and false or forced-choice strategies.
The California Department of Justice has provided law enforcement agencies with guidance explaining the restrictions.
The DOJ bulletin states that minimization can include falsely communicating that criminal conduct is justified, excusable or accidental. Maximization can include repeatedly asserting guilt despite denials or exaggerating the strength of evidence, including suggesting that nonexistent evidence exists.
There is a narrow exception when an officer reasonably believes questioning is necessary to protect life or property from an imminent threat. Even then, questioning must be limited to information reasonably necessary to address that threat.
What this means in El Dorado County
For residents of Placerville, El Dorado Hills, Cameron Park, Pollock Pines, Georgetown and South Lake Tahoe, the practical question is not whether California has banned deceptive juvenile interrogation. It has.
The more important question is whether the restrictions affect the ability of local investigators to develop cases.
Publicly available El Dorado County Sheriff’s Office policy materials show that juvenile interrogations are governed by the department’s policy on temporary custody of juveniles. The Sheriff’s Office’s current policy manual also requires Miranda warnings for custodial interrogations unless an exception applies.
The department’s policy further states that custodial interrogations involving individuals suspected of violent felonies should be recorded in their entirety, with reasonable efforts made to obtain functioning recording equipment.
That creates an important distinction for the local debate.
A restriction on deception does not prevent an investigator from interviewing a juvenile. It does not prevent investigators from confronting a suspect with legitimate evidence. It does not eliminate traditional investigative work such as examining physical evidence, interviewing witnesses, reviewing digital evidence or reconstructing a crime.
Instead, it limits how investigators may attempt to obtain admissions from a juvenile suspect.
California Courts’ guidance likewise recognizes that juveniles have special legal protections during custodial interrogation. Youths 17 and younger generally must consult with an attorney before custodial questioning, and that consultation cannot be waived, subject to limited emergency exceptions.
The false-confession question
The policy debate exists because a confession can be powerful evidence — but it can also be wrong.
California’s own legislative history surrounding electronic recording of juvenile interrogations recognized the competing interests. State lawmakers noted that confessions can help solve crimes but also can contribute to wrongful convictions, and argued that recording interrogations allows courts and juries to evaluate what actually occurred during questioning.
California courts have also addressed the particular vulnerability of juveniles during interrogation.
California judicial materials discuss factors including a minor’s age, the length and circumstances of questioning, promises of leniency, deception and interrogation tactics that could produce an untrue statement.
The underlying concern is straightforward: teenagers are not simply smaller adults.
Their developmental stage can affect their understanding of consequences, their susceptibility to authority and their willingness to tell an interrogator what they believe the adult wants to hear.
What the study does — and does not — prove
The new research is useful because it tests one specific prediction: If investigators lose deceptive interrogation tactics, will fewer cases be cleared?
The data do not show such a decline.
The researchers found the arrest-clearance result remained non-negative across multiple statistical approaches. An adult-offender placebo analysis also found that the pattern for arrest clearance was different for juveniles, while a decline in prosecution-declined clearances was not specific to juveniles.
But the researchers explicitly warn against reading the results too broadly.
The data measure outcomes reported through NIBRS. They do not provide a case-by-case record showing which investigator used deception, what tactic was used, whether a confession was obtained or whether a particular confession was accurate. The researchers say future work needs case-level information on interrogation practices, evidence development and prosecutorial decisions.
In other words, the study can tell us something about system-level case resolution.
It cannot tell us whether a particular El Dorado County detective would have solved a particular case differently if a particular interrogation tactic had been available.
A local question worth asking
That gap presents an opportunity for local accountability and research.
If El Dorado County officials want to determine whether California’s juvenile interrogation restrictions have affected public safety, the answer will not come from a national aggregate alone.
It would require examining local data.
How many juvenile investigations have been conducted since the California restrictions took effect? How many resulted in arrests? How many were cleared without an arrest? How many were referred to the El Dorado County District Attorney’s Office or juvenile court? How often were cases declined because investigators lacked sufficient evidence?
And perhaps most importantly: Have local investigators identified any cases in which the inability to use a prohibited deceptive tactic materially affected the outcome?
Those are questions that could be answered through county records, Sheriff’s Office data, court records and interviews with prosecutors and defense attorneys.
They would also move the discussion away from ideology and toward evidence.
The bottom line
For El Dorado County residents, the emerging research offers a noteworthy data point: restrictions on deceptive juvenile interrogation tactics have not, in the study examined, produced the feared collapse in police case clearances.
But it would be premature to claim that the research proves California’s law has had no effect.
California’s statute was not the principal treatment examined in the current seven-state study, and the researchers themselves acknowledge important limitations in the available administrative data.
The most defensible conclusion is therefore narrower — and more useful.
There is currently no evidence from this study that banning deceptive interrogation tactics causes a systemwide decline in juvenile case clearance.
Whether the same is true in El Dorado County remains an empirical question.
And that is a question worth asking.
