Stanley cups are all the rage, but a recent lead scare caused the company to respond. People are posting their home lead tests online, which raises questions about evidence.

The company responded to concerns with a short statement on its website, which students can analyze. The main point is somewhere in the middle, after the explanation. They acknowledge using lead according to industry standards but assure us that it’s “inaccessible.”

TikTokers and others are showing positive home tests, but a BBC article quotes NYU Public Health Professor Jack Caravanos, who confirms Stanley’s claim:

“There appears to be lead, according to the report, but I had trouble detecting it and wasn’t able to detect it using state-of-the-art equipment." He says this is probably because the lead was "too deep inside the unit," meaning it would be very tough to be exposed to it or ingest it.

He does express disappointment that Stanley is using lead at all. The company isn’t complying with California’s Proposition 65, which requires companies to disclose any amount of lead. In the statement and on the website FAQs, Stanley attests, “all Stanley items comply with Prop 65 and FDA requirements,” but they didn’t specifically disclose that products use lead—until they posted the statement addressing concerns.

Students might have their own experience with Stanley cups and can discuss how they reacted to videos. Are they swayed by them? Has fear driven them to discarded their custom-engraved, nail-polish-matched Quencher? Does a public health professor’s test change their opinion?

Despite the company’s lack of complete transparency, it would be unfortunate if sales take a hit because of false information. Maybe the dramatic sales increase for Stanley—a little-known thermos company turned $750-million internet craze—made it vulnerable to deceptive claims.

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