• videocam Live Webinar with Live Q&A
  • calendar_month July 7, 2026 @ 1:00 PM ET/10:00 AM PT
  • signal_cellular_alt Intermediate
  • card_travel Environmental
  • schedule 90 minutes

PFAS Litigation: Expert Depositions and Scientific Evidence

Causation, Source Identification, Sampling Data, Daubert Challenges, Deposition Strategy

About the Course

Introduction

This CLE webinar will navigate the expert, scientific, and evidentiary issues that drive PFAS litigation. The panel will examine how counsel can develop and/or challenge proof of exposure, source identification, fate and transport, causation, allocation, and damages in PFAS-based disputes. The panel will cover working with experts and complicated scientific evidence, such as environmental sampling, analytical chemistry, toxicology, epidemiology, hydrogeology, and source analysis.

Description

The authoritative panel will discuss expert selection and preparation, sampling and testing disputes, source identification and allocation, general and specific causation, Rule 702 and Daubert challenges, and taking and defending expert depositions.

Listen as our panel discusses working with PFAS experts, probing scientific opinions, preparing for expert depositions, challenging methodologies, and presenting complex scientific evidence in environmental cases.

Presented By

Kegan A. Brown
Partner
Lowenstein Sandler LLP

Mr. Brown’s practice focuses on environmental litigation, environmental regulation, product liability, toxic torts, ESG, and transactional due diligence. He represents clients throughout the full lifecycle of complex environmental and products liability litigations and regulatory matters. He has extensive experience addressing litigation and regulatory matters involving natural resource damages, contaminated sediments, and emerging chemicals of concern, particularly per- and polyfluoroalkyl substances (PFAS). Mr. Brown has successfully defended claims in numerous federal and state courts across the country and also regularly counsels buyers, sellers, lenders, and underwriters on the full spectrum of environmental issues that may affect transactions.   

Jaana Pietari, PhD, MBA, PE
Principal, Americas PFAS Team Leader
Ramboll

Dr. Pietari has more than 20 years of professional and academic experience in environmental remediation, the fate and transport of contaminants, the reconstruction of environmental releases to groundwater and sediments, and environmental forensics. She has evaluated the sources and fate and transport of emerging contaminants, such as PFAS and 1,2,3-trichloropropane (1,2,3-TCP); chlorinated solvents; polycyclic aromatic hydrocarbons (PAHs); petroleum hydrocarbons; and polychlorinated biphenyls (PCBs). Dr. Pietari's consulting assignments involve various environmental media, including soil, groundwater, and sediments, in settings from residential properties to urban mega-sites and industrial facilities, integrated steel mills, refineries, petroleum terminals, pharmaceutical manufacturing plants, agricultural chemical distribution facilities, and manufacturing sites. She has supported clients in identifying and evaluating sources of contaminants, including conducting investigations to identify sources of PFAS in stormwater and in consumer products and the associated manufacturing processes, and in developing strategies to replace PFAS-containing firefighting foams.

David I. Schifrin
Partner
Hollingsworth LLP

Mr. Schifrin is first and foremost a litigator. He is adept at synthesizing complex facts and legal argument in support of his clients. Mr. Schifrin brings these skills to bear in his practice of complex litigation across the country, handling pharmaceutical, products liability, and toxic tort matters. His practice also includes extensive work preparing and defending expert witnesses at deposition and trial. Mr. Schifrin has considerable experience preparing corporate witnesses in both their personal and representative capacities. He also has extensive experience managing corporate discovery issues, including the review and analysis of corporate documents to prepare strategic defenses to likely liability themes.

Credit Information
  • This 90-minute webinar is eligible in most states for 1.5 CLE credits.


  • Live Online


    On Demand

Date + Time

  • event

    Tuesday, July 7, 2026

  • schedule

    1:00 PM ET/10:00 AM PT

I. Introduction: current PFAS litigation and expert evidence    

II. Building a team of experts

A. Analytical chemistry, hydrogeology, fate and transport, source identification

B. Toxicology, epidemiology, and medical causation

C. Damages, remediation, and allocation

III. Sampling, testing, data reliability, chain of custody, and common challenges

IV. Proving and challenging source identification and exposure

V. Causation and health risk evidence

VI. Expert discovery, depositions, and Daubert/Rule 702 strategy

VII. Using expert evidence in settlement, mediation, and trial

The panel will explore these and other key areas:

  • PFAS-specific expert evidence, key differences to other contaminants
  • Understanding sampling, laboratory methods, limits, and data validation
  • Proving or challenging source identification, exposure pathways, and allocation
  • Impacts of toxicology, epidemiology, and medical causation evidence
  • Preparing, taking, and defending expert depositions
  • Rule 702 and Daubert challenges to PFAS expert opinions
  • Evidence use in settlement, mediation, motions, and trial