Idk about the acetaminophen part. I just read tons of articles about that being a rumor.
Heres the article link
http://www.itchmo.com/canidae-releas...aminophen-2868
It seems the laboratory that was doing the testing were making false reports. They did it to more than one manufacturer.
I really hope they get to the bottom of this because if its true, I'm taking Riley off of it.