Only if Walmart failed to apply a level of diligence sufficient to protect against lead exposure risk, a known risk with laws in place demanding appropriate car

Only if Walmart failed to apply a level of diligence sufficient to protect against lead exposure risk, a known risk with laws in place demanding appropriate care and notification and recalls. What is the industry-accepted, “will pass muster by a judge and jury”, level of due diligence that is considered minimally acceptable when purchasing Internet-connected devices from a supplier for resale to consumers? The current answer as I understand is, simply, “no level of due diligence is expected with regards to network functionality, as the relevant UL/CE standards for ‘networking’ only concern themselves with RF interference at most”. Should all computer resellers of any business size, whether Walmart nationwide or PC Hand-Me-Downs in a single city, be required to hire specialists to disassemble device firmwares for auditing purposes? Should this burden be placed on importers? Is this even legal under the DMCA? Should the UL certification be found at fault here, since clearly they did not audit nor certify the device’s preinstalled firmware?