> It is thus not common for the law to mandate that the manufacturers know exactly what has happened to every ounce of the substances that make up their product, or for the law to make this criminality contagious, such that anyone who does business with anyone who does business with anyone who does business with slave labor goes to jail.
That is a strawman argument. The article quite clearly states the the claim lawsuit aims to prove is this:
"knowingly benefiting from and aiding and abetting the cruel and brutal use of young children."
Specifically, they claim there is evidence of a direct links in the supply chain:
"Certainly the supply chain is opaque. It is complex. But the plaintiffs all were injured and killed at mines owned by companies that have been publicly disclosed as sellers of cobalt to our defendants.
There is quite a bit more evidence contained in the complaint linked in the article. It is pretty clear that any "opaqueness" that does exist in the sourcing of Cobalt is a deliberate attempt to limit the perception of culpability.