Investigators say the company sent out contractors to quietly remove its medication from store shelves when it learned that over 40 of its over the counter drugs were contaminated. Among the products removed were Children's Motrin, Tylenol and Benadryl.
Senior Johnson and Johnson executive Colleen Goggins denied knowing about the secret recall until recently.
"I have since learned from looking at documents that there was a retrieval going on. I did not know that at the time of my testimony in May, I don't believe," said Goggins.
"This testimony is lacking in credibility," said Sen. Dennis Kucinich, D-Ohio.
Some lawmakers also criticized the Food And Drug Administration for lax oversight.