Erickson v. Monsanto · King County, Washington

The Sky Valley case.

PCBs leaked inside a school for years. The teachers who worked there suffered brain injury. Here is the science — and how it holds up in court.

Walk the case Four steps · about three minutes
01 · The story

A building made its teachers sick.

For years, PCBs leaked from aging fluorescent-light ballasts and degraded caulking inside the Sky Valley Education Center near Monroe, Washington. The teachers and staff worked in those rooms day after day.

Many developed neurological and cognitive injury — problems with memory, concentration, and processing, alongside headaches and other neurobehavioral symptoms consistent with chronic PCB exposure. In Erickson v. Monsanto, they sued the company that made the PCBs. The first three teachers went to trial in 2021; more cases followed.

Dr. James G. Dahlgren, M.D. served as the plaintiffs’ toxicology expert.

NextWhy PCBs injure the brain
02 · The science

How a PCB reaches the brain.

PCBs are persistent, fat-soluble industrial chemicals — and established neurotoxicants. Chronic exposure disrupts thyroid-hormone signaling (which the brain depends on), interferes with dopamine systems, and dysregulates calcium-dependent signaling inside neurons. Those mechanisms map onto the deficits the teachers reported: memory, learning, attention, and executive function.

Because PCBs accumulate in fatty tissue and clear over years, exposure inside a building is cumulative — the dose builds with every year in the room.

NextHow the science holds up
03 · The evidence

Three sources behind every claim.

Every claim in the garden is rated by evidence tier — regulatory bodies (IARC, ATSDR, EPA) first, then systematic reviews, then individual peer-reviewed studies. Nothing is asserted without its sources attached, so a claim can be taken straight into a Daubert analysis.

The AI workspace reads only from that curated evidence. Ask it for the theory of harm or the Daubert posture and it answers from the record, with citations — and tells you plainly where the evidence is thin.

NextThe full case file
04 · The case file

The full record, under lock.

Behind the public summary sits the complete case file — 1,959 documents: depositions, expert reports, exhibits, motions, and correspondence. Because it also holds protected medical records, it is gated: authorized counsel and retained experts sign in to read it; everyone else sees the de-identified summary.

Sky Valley is one worked case. The garden also covers other compounds, audiences, and the full toxicology workflow.
Explore the full platform →