That is the point of the entire article. CR’s scientists also note that the FSIS cutoffs seem much higher than those used by other scientists, even in other go

That is the point of the entire article. CR’s scientists also note that the FSIS cutoffs seem much higher than those used by other scientists, even in other government agencies. And in documents provided to CR, the FSIS acknowledged that even for drugs that should not be in meat, the agency sets its cutoffs above what the test can measure. and Some experts, however, worry that by relying on higher cutoffs, the FSIS may overlook possible health threats. Some research, including a 2015 review in the Journal of Veterinary Science & Toxicology, suggests that long-term exposure to low levels of drug residue in meat could increase the risk of cancer, fetal harm, antibiotic resistance, and more. The article is more disturbing than what I quoted. Also, this is not about antibiotics, it's about substances that are potentially fatal to some, and other substances that are carcinogenic. It's not about "why did it get there in the first places" it's that it shouldn't be there because it's harmful to health.