- 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
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Welcome! Strafford is now BARBRI! The expert courses you know from the trusted global leader in legal education.
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.
Credit Information
-
This 90-minute webinar is eligible in most states for 1.5 CLE credits.
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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
An error occurred while processing the template.
The following has evaluated to null or missing:
==> barbriRedisCacheAPI.get("barbripass", productId) [in template "20096#20121#2885355" at line 5, column 77]
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----
----
FTL stack trace ("~" means nesting-related):
- Failed at: response = barbriRedisCacheAPI.get("b... [in template "20096#20121#2885355" at line 5, column 66]
---- 1<#assign productId = ''/> 2 <#if (productID.getData())?? && productID.getData()?has_content> 3 <#assign productId = productID.getData() /> 4 </#if> 5 <#assign response = barbriRedisCacheAPI.get("barbripass", productId) 6 json = jsonFactoryUtil.createJSONObject(response) 7 /> 8 9 <div class="card"> 10 <div class="card-body"> 11 <div class="row justify-content-between align-items-center"> 12 <div class="col-auto col-sm-auto"> 13 <div class="btn cle_btn" id="modalPassShortName"><#if (passName.getData())??>${passName.getData()}</#if></div> 14 </div> 15 <div class="col-auto col-sm-auto pl-lg-0"> 16 <span class="sale-price" id="modalPassPrice">$${json.pricebook?replace(",", "")?number?string("#,##0.00")}</span> 17 </div> 18 </div> 19 <div class="small_heading_area" id="modalPassFullName"><#if (title.getData())??>${title.getData()}</#if></div> 20 <p><#if (unlimitedText.getData())??>${unlimitedText.getData()}</#if>:</p> 21 <ul class="common-list disc_list paddNone"> 22 <#if (benefits.getData())??> 23 ${benefits.getData()} 24</#if> 25 </ul> 26 </div> 27 <div class="btn-float"> 28 <div class="premium-cle-pass cart-item"> 29 <input type="hidden" class="product-id" value="${productId}"> 30 <input type="hidden" class="product-name" value="${json.name}"> 31 <input type="hidden" class="pass-value" value="${passName.getData()}"> 32 <input type="hidden" class="product-price" value="${json.pricebook}"> 33 <input type="hidden" class="passAccessLengthMonths" value="${json.passAccessLengthMonths}"> 34 <input type="hidden" class="product-pass" value="family"> 35 <input type="hidden" class="product-expireDate" value=""> 36 37 <button 38 class="btn pc_theme_btn btn-primary btn_maxwidth_xxl_large add-to-cart" 39 aria-label="Buy Now" 40 data-redirect-checkout="true" 41 > 42 <span class="material-symbols-rounded"> shopping_cart </span> 43 Buy Now 44 </button> 45 </div> 46 </div> 47 </div> 48 49 <script> 50$(document).on('click', '.add-to-cart', function () { 51 let monthsToAdd = parseInt($(".passAccessLengthMonths").val()); 52 let currentDate = new Date(); 53 let futureDate = new Date(currentDate); 54 // Add months dynamically 55 futureDate.setMonth(futureDate.getMonth() + monthsToAdd); 56 57 // Handle overflow (e.g., Jan 31 + 1 month) 58 if (futureDate.getDate() !== currentDate.getDate()) { 59 futureDate.setDate(0); // last day of previous month 60 } 61 62 // Format as MM/DD/YYYY 63 function formatDateMMDDYYYY(date) { 64 let mm = String(date.getMonth() + 1).padStart(2, '0'); 65 let dd = String(date.getDate()).padStart(2, '0'); 66 let yyyy = date.getFullYear(); 67 return mm + '/' + dd + '/' + yyyy; 68 } 69 $(".product-expireDate").val(formatDateMMDDYYYY(futureDate)); 70 71 // Then close the modal 72 $('.single_option').modal('hide'); 73 }); 74</script> An error occurred while processing the template.
The following has evaluated to null or missing:
==> barbriRedisCacheAPI.get("barbripass", productId) [in template "20096#20121#2885355" at line 5, column 77]
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----
----
FTL stack trace ("~" means nesting-related):
- Failed at: response = barbriRedisCacheAPI.get("b... [in template "20096#20121#2885355" at line 5, column 66]
---- 1<#assign productId = ''/> 2 <#if (productID.getData())?? && productID.getData()?has_content> 3 <#assign productId = productID.getData() /> 4 </#if> 5 <#assign response = barbriRedisCacheAPI.get("barbripass", productId) 6 json = jsonFactoryUtil.createJSONObject(response) 7 /> 8 9 <div class="card"> 10 <div class="card-body"> 11 <div class="row justify-content-between align-items-center"> 12 <div class="col-auto col-sm-auto"> 13 <div class="btn cle_btn" id="modalPassShortName"><#if (passName.getData())??>${passName.getData()}</#if></div> 14 </div> 15 <div class="col-auto col-sm-auto pl-lg-0"> 16 <span class="sale-price" id="modalPassPrice">$${json.pricebook?replace(",", "")?number?string("#,##0.00")}</span> 17 </div> 18 </div> 19 <div class="small_heading_area" id="modalPassFullName"><#if (title.getData())??>${title.getData()}</#if></div> 20 <p><#if (unlimitedText.getData())??>${unlimitedText.getData()}</#if>:</p> 21 <ul class="common-list disc_list paddNone"> 22 <#if (benefits.getData())??> 23 ${benefits.getData()} 24</#if> 25 </ul> 26 </div> 27 <div class="btn-float"> 28 <div class="premium-cle-pass cart-item"> 29 <input type="hidden" class="product-id" value="${productId}"> 30 <input type="hidden" class="product-name" value="${json.name}"> 31 <input type="hidden" class="pass-value" value="${passName.getData()}"> 32 <input type="hidden" class="product-price" value="${json.pricebook}"> 33 <input type="hidden" class="passAccessLengthMonths" value="${json.passAccessLengthMonths}"> 34 <input type="hidden" class="product-pass" value="family"> 35 <input type="hidden" class="product-expireDate" value=""> 36 37 <button 38 class="btn pc_theme_btn btn-primary btn_maxwidth_xxl_large add-to-cart" 39 aria-label="Buy Now" 40 data-redirect-checkout="true" 41 > 42 <span class="material-symbols-rounded"> shopping_cart </span> 43 Buy Now 44 </button> 45 </div> 46 </div> 47 </div> 48 49 <script> 50$(document).on('click', '.add-to-cart', function () { 51 let monthsToAdd = parseInt($(".passAccessLengthMonths").val()); 52 let currentDate = new Date(); 53 let futureDate = new Date(currentDate); 54 // Add months dynamically 55 futureDate.setMonth(futureDate.getMonth() + monthsToAdd); 56 57 // Handle overflow (e.g., Jan 31 + 1 month) 58 if (futureDate.getDate() !== currentDate.getDate()) { 59 futureDate.setDate(0); // last day of previous month 60 } 61 62 // Format as MM/DD/YYYY 63 function formatDateMMDDYYYY(date) { 64 let mm = String(date.getMonth() + 1).padStart(2, '0'); 65 let dd = String(date.getDate()).padStart(2, '0'); 66 let yyyy = date.getFullYear(); 67 return mm + '/' + dd + '/' + yyyy; 68 } 69 $(".product-expireDate").val(formatDateMMDDYYYY(futureDate)); 70 71 // Then close the modal 72 $('.single_option').modal('hide'); 73 }); 74</script> An error occurred while processing the template.
The following has evaluated to null or missing:
==> barbriRedisCacheAPI.get("barbripass", productId) [in template "20096#20121#2885355" at line 5, column 77]
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----
----
FTL stack trace ("~" means nesting-related):
- Failed at: response = barbriRedisCacheAPI.get("b... [in template "20096#20121#2885355" at line 5, column 66]
---- 1<#assign productId = ''/> 2 <#if (productID.getData())?? && productID.getData()?has_content> 3 <#assign productId = productID.getData() /> 4 </#if> 5 <#assign response = barbriRedisCacheAPI.get("barbripass", productId) 6 json = jsonFactoryUtil.createJSONObject(response) 7 /> 8 9 <div class="card"> 10 <div class="card-body"> 11 <div class="row justify-content-between align-items-center"> 12 <div class="col-auto col-sm-auto"> 13 <div class="btn cle_btn" id="modalPassShortName"><#if (passName.getData())??>${passName.getData()}</#if></div> 14 </div> 15 <div class="col-auto col-sm-auto pl-lg-0"> 16 <span class="sale-price" id="modalPassPrice">$${json.pricebook?replace(",", "")?number?string("#,##0.00")}</span> 17 </div> 18 </div> 19 <div class="small_heading_area" id="modalPassFullName"><#if (title.getData())??>${title.getData()}</#if></div> 20 <p><#if (unlimitedText.getData())??>${unlimitedText.getData()}</#if>:</p> 21 <ul class="common-list disc_list paddNone"> 22 <#if (benefits.getData())??> 23 ${benefits.getData()} 24</#if> 25 </ul> 26 </div> 27 <div class="btn-float"> 28 <div class="premium-cle-pass cart-item"> 29 <input type="hidden" class="product-id" value="${productId}"> 30 <input type="hidden" class="product-name" value="${json.name}"> 31 <input type="hidden" class="pass-value" value="${passName.getData()}"> 32 <input type="hidden" class="product-price" value="${json.pricebook}"> 33 <input type="hidden" class="passAccessLengthMonths" value="${json.passAccessLengthMonths}"> 34 <input type="hidden" class="product-pass" value="family"> 35 <input type="hidden" class="product-expireDate" value=""> 36 37 <button 38 class="btn pc_theme_btn btn-primary btn_maxwidth_xxl_large add-to-cart" 39 aria-label="Buy Now" 40 data-redirect-checkout="true" 41 > 42 <span class="material-symbols-rounded"> shopping_cart </span> 43 Buy Now 44 </button> 45 </div> 46 </div> 47 </div> 48 49 <script> 50$(document).on('click', '.add-to-cart', function () { 51 let monthsToAdd = parseInt($(".passAccessLengthMonths").val()); 52 let currentDate = new Date(); 53 let futureDate = new Date(currentDate); 54 // Add months dynamically 55 futureDate.setMonth(futureDate.getMonth() + monthsToAdd); 56 57 // Handle overflow (e.g., Jan 31 + 1 month) 58 if (futureDate.getDate() !== currentDate.getDate()) { 59 futureDate.setDate(0); // last day of previous month 60 } 61 62 // Format as MM/DD/YYYY 63 function formatDateMMDDYYYY(date) { 64 let mm = String(date.getMonth() + 1).padStart(2, '0'); 65 let dd = String(date.getDate()).padStart(2, '0'); 66 let yyyy = date.getFullYear(); 67 return mm + '/' + dd + '/' + yyyy; 68 } 69 $(".product-expireDate").val(formatDateMMDDYYYY(futureDate)); 70 71 // Then close the modal 72 $('.single_option').modal('hide'); 73 }); 74</script> An error occurred while processing the template.
The following has evaluated to null or missing:
==> barbriRedisCacheAPI.get("barbripass", productId) [in template "20096#20121#2885355" at line 5, column 77]
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----
----
FTL stack trace ("~" means nesting-related):
- Failed at: response = barbriRedisCacheAPI.get("b... [in template "20096#20121#2885355" at line 5, column 66]
---- 1<#assign productId = ''/> 2 <#if (productID.getData())?? && productID.getData()?has_content> 3 <#assign productId = productID.getData() /> 4 </#if> 5 <#assign response = barbriRedisCacheAPI.get("barbripass", productId) 6 json = jsonFactoryUtil.createJSONObject(response) 7 /> 8 9 <div class="card"> 10 <div class="card-body"> 11 <div class="row justify-content-between align-items-center"> 12 <div class="col-auto col-sm-auto"> 13 <div class="btn cle_btn" id="modalPassShortName"><#if (passName.getData())??>${passName.getData()}</#if></div> 14 </div> 15 <div class="col-auto col-sm-auto pl-lg-0"> 16 <span class="sale-price" id="modalPassPrice">$${json.pricebook?replace(",", "")?number?string("#,##0.00")}</span> 17 </div> 18 </div> 19 <div class="small_heading_area" id="modalPassFullName"><#if (title.getData())??>${title.getData()}</#if></div> 20 <p><#if (unlimitedText.getData())??>${unlimitedText.getData()}</#if>:</p> 21 <ul class="common-list disc_list paddNone"> 22 <#if (benefits.getData())??> 23 ${benefits.getData()} 24</#if> 25 </ul> 26 </div> 27 <div class="btn-float"> 28 <div class="premium-cle-pass cart-item"> 29 <input type="hidden" class="product-id" value="${productId}"> 30 <input type="hidden" class="product-name" value="${json.name}"> 31 <input type="hidden" class="pass-value" value="${passName.getData()}"> 32 <input type="hidden" class="product-price" value="${json.pricebook}"> 33 <input type="hidden" class="passAccessLengthMonths" value="${json.passAccessLengthMonths}"> 34 <input type="hidden" class="product-pass" value="family"> 35 <input type="hidden" class="product-expireDate" value=""> 36 37 <button 38 class="btn pc_theme_btn btn-primary btn_maxwidth_xxl_large add-to-cart" 39 aria-label="Buy Now" 40 data-redirect-checkout="true" 41 > 42 <span class="material-symbols-rounded"> shopping_cart </span> 43 Buy Now 44 </button> 45 </div> 46 </div> 47 </div> 48 49 <script> 50$(document).on('click', '.add-to-cart', function () { 51 let monthsToAdd = parseInt($(".passAccessLengthMonths").val()); 52 let currentDate = new Date(); 53 let futureDate = new Date(currentDate); 54 // Add months dynamically 55 futureDate.setMonth(futureDate.getMonth() + monthsToAdd); 56 57 // Handle overflow (e.g., Jan 31 + 1 month) 58 if (futureDate.getDate() !== currentDate.getDate()) { 59 futureDate.setDate(0); // last day of previous month 60 } 61 62 // Format as MM/DD/YYYY 63 function formatDateMMDDYYYY(date) { 64 let mm = String(date.getMonth() + 1).padStart(2, '0'); 65 let dd = String(date.getDate()).padStart(2, '0'); 66 let yyyy = date.getFullYear(); 67 return mm + '/' + dd + '/' + yyyy; 68 } 69 $(".product-expireDate").val(formatDateMMDDYYYY(futureDate)); 70 71 // Then close the modal 72 $('.single_option').modal('hide'); 73 }); 74</script> Related Courses
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