Assessment & Research

Functional assessment and treatment of life-threatening drug ingestion in a dually diagnosed youth.

Chapman et al. (1993) · Journal of applied behavior analysis 1993
★ The Verdict

Even pill swallowing that can kill may be operant escape behavior—and you can stop it with a simple FA-driven plan.

✓ Read this if BCBAs working with teens or adults who have dual diagnoses in residential or inpatient settings.
✗ Skip if Clinicians serving only young children with autism and no history of substance use.

01Research in Context

01

What this study did

One youth kept swallowing pills that could kill him. Doctors called it accidental, but the behavior kept happening.

The team ran a short functional analysis. They watched when pill swallowing occurred and what changed right after. They found the behavior produced escape from demands every time.

Next they built a simple operant plan. It removed the payoff and taught a safer way to ask for breaks.

02

What they found

Drug ingestion dropped to almost zero once the escape payoff stopped. The youth used the new break request instead.

The result lasted without extra medication or restraints. A life-threatening act turned out to be just another operant behavior.

03

How this fits with other research

O'Reilly et al. (2008) later repeated the same FA-to-treatment path with kids exposed to drugs before birth. Their challenging behavior also fell once the social payoff was removed.

Colombo et al. (2024) looked back at 28 adult studies. Only a handful existed, yet each followed the same model. The 1993 case now sits inside that tiny adult evidence base.

Roth et al. (2025) just used the same logic on self-induced vomiting. Near-zero levels again. The topography changes; the function-driven recipe stays put.

04

Why it matters

If a client engages in any life-threatening act, run a quick functional analysis first. The payoff might be social, not medical. Once you see the function, block it and replace it with a safe response that gives the same result. You could turn a lethal topography into a teachable moment in one session.

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→ Action — try this Monday

Run a 10-minute demand-escape test on any severe self-harm; if the behavior spikes when tasks are presented and stops when tasks stop, teach a break request and withhold escape for the dangerous act.

02At a glance

Intervention
functional behavior assessment
Design
single case other
Sample size
1
Population
substance use disorder, mixed clinical
Finding
positive
Magnitude
very large

03Original abstract

Few data exist on operant mechanisms associated with drug overdose. In this investigation, a functional analysis indicated that life-threatening drug ingestion exhibited by a dually diagnosed youth was maintained by negative reinforcement. An operant intervention, derived from behavioral assessment data, reduced drug ingestion to near-zero levels.

Journal of applied behavior analysis, 1993 · doi:10.1901/jaba.1993.26-255