Dry Ice Bomb Not a Manifestation of ADHD: District Wins Expulsion Case

A Poway Unified School District eighth-grader with ADHD was expelled after constructing and detonating a dry ice bomb in a school bathroom, injuring a teacher. His parent challenged the district's manifestation determination, arguing the conduct was impulsive and caused by his ADHD. The ALJ ruled that the carefully planned, multi-step nature of the incident meant it was not a manifestation of Student's disability, and the expulsion was upheld.

What Happened

Student was an eighth-grade boy at Meadowbrook Middle School who qualified for special education under the category of Other Health Impairment (OHI) due to ADHD. His IEP recognized that he had significant challenges with attention, impulsivity — including frequent talking out and acting out in class — and working independently. His IEP included a Behavior Support Plan and Resource Specialist Program services. On February 1, 2010, Student constructed a dry ice bomb, hid it in a school bathroom stall, and it exploded — injuring a teacher. Student was arrested, suspended, and the district initiated expulsion proceedings.

Because Student was a special education student being suspended for more than 10 school days, federal law required the district to hold a Manifestation Determination Review (MDR) — a meeting to decide whether the conduct that led to discipline was caused by, or directly and substantially related to, his disability. The district held that meeting on February 8, 2010, with Parent present. The IEP team reviewed Student's records, assessments, and a school psychologist's report, and concluded that the conduct was not a manifestation of Student's ADHD. Parent disagreed and filed for due process, arguing that Student's behavior was impulsive and directly caused by his disability — and that he had not taken his ADHD medication that day.

What the ALJ Found

The ALJ ruled in favor of the district on the sole issue presented. While acknowledging that Student was genuinely impulsive as a characteristic of his ADHD — a fact no one disputed — the ALJ found that the specific conduct on February 1, 2010 was not impulsive in any meaningful legal sense. The school psychologist testified credibly that Student had (1) researched how to obtain dry ice, (2) procured the dry ice, (3) chosen a location to construct the device, (4) built the bomb, and (5) selected a hiding spot and waited for detonation. A teacher had even overheard Student asking other students how to get dry ice a couple of weeks earlier and warned him not to. This was a planned, multi-step course of conduct carried out over a significant period of time — not the kind of spontaneous, in-the-moment action typically associated with ADHD-related impulsivity.

Parent submitted letters from two physicians supporting the claim that Student's behavior reflected poor impulse control. However, the ALJ gave these letters little weight: neither doctor testified, the letters were written after the MDR meeting, neither specifically analyzed the February 1 incident, and one letter was based on unproven assumptions about how Student obtained the dry ice. The ALJ also noted that the district had fully implemented Student's IEP — a point Parent did not dispute — so there was no basis to find the conduct resulted from an IEP implementation failure either.

What Was Ordered

The student's request for relief was denied.
The ALJ ruled that Student's conduct on February 1, 2010 was not caused by, and did not have a direct and substantial relationship to, his ADHD.
The district's manifestation determination was upheld, meaning the expulsion could proceed under standard disciplinary rules applicable to all students.

Why This Matters for Parents

Impulsivity as a disability characteristic does not automatically make every impulsive-seeming act a manifestation of that disability. The law requires the specific conduct at issue to be caused by or directly related to the disability. A student with ADHD can still be held to standard disciplinary rules when the misconduct involved planning, research, and deliberate steps over time — even if impulsivity is a known trait.
The more steps and planning involved in an incident, the harder it is to argue manifestation. The ALJ cited case law holding that behavior occurring over hours or days with a series of decisions cannot be considered impulsive, even for a student with documented impulse-control problems. Parents should understand that courts and ALJs look at the specific mechanics of the conduct, not just the student's general disability profile.
Medical letters supporting a manifestation claim carry far more weight if the doctor testifies and directly addresses the specific incident. In this case, physician letters were available but the doctors did not appear at the hearing, and their letters contained assumptions that weren't proven. If you're challenging a manifestation determination, expert witnesses who can be cross-examined and who specifically analyze the incident in question are much more persuasive than written letters alone.
Make sure to raise IEP implementation concerns at the MDR meeting itself, not just at hearing. Parent did not argue at either the MDR meeting or the hearing that the district had failed to implement Student's IEP. Because this argument wasn't made, it couldn't support a finding of manifestation. If you believe your child's IEP was not being followed at the time of an incident, say so clearly and document it — both at the MDR meeting and in any subsequent proceedings.

What Happened

What the ALJ Found

What Was Ordered

The student's request for relief was denied.
The ALJ ruled that Student's conduct on February 1, 2010 was not caused by, and did not have a direct and substantial relationship to, his ADHD.
The district's manifestation determination was upheld, meaning the expulsion could proceed under standard disciplinary rules applicable to all students.

Why This Matters for Parents

Impulsivity as a disability characteristic does not automatically make every impulsive-seeming act a manifestation of that disability. The law requires the specific conduct at issue to be caused by or directly related to the disability. A student with ADHD can still be held to standard disciplinary rules when the misconduct involved planning, research, and deliberate steps over time — even if impulsivity is a known trait.
The more steps and planning involved in an incident, the harder it is to argue manifestation. The ALJ cited case law holding that behavior occurring over hours or days with a series of decisions cannot be considered impulsive, even for a student with documented impulse-control problems. Parents should understand that courts and ALJs look at the specific mechanics of the conduct, not just the student's general disability profile.
Medical letters supporting a manifestation claim carry far more weight if the doctor testifies and directly addresses the specific incident. In this case, physician letters were available but the doctors did not appear at the hearing, and their letters contained assumptions that weren't proven. If you're challenging a manifestation determination, expert witnesses who can be cross-examined and who specifically analyze the incident in question are much more persuasive than written letters alone.
Make sure to raise IEP implementation concerns at the MDR meeting itself, not just at hearing. Parent did not argue at either the MDR meeting or the hearing that the district had failed to implement Student's IEP. Because this argument wasn't made, it couldn't support a finding of manifestation. If you believe your child's IEP was not being followed at the time of an incident, say so clearly and document it — both at the MDR meeting and in any subsequent proceedings.