The glasses were sold at a Warner Brothers Studios store in Burbank.
The company that makes the glasses, Vandor LLC of Utah, said its products were well within lead limits for adults. Warner Brothers said the glasses were intended for adults.
But a spokesman for the U.S. Consumer Product Safety Commission, Scott Wolfson, said Monday that the agency considers the glasses children's products and is currently collecting samples for its own testing.
The study was done following a June recall of 12 million McDonald's "Shrek" glasses found to contain high levels of cadmium.
The Associated Press said glasses sold at Warner Brothers also had high levels of cadmium.
The Associated Press contributed to this story.