It depends upon the population samples. Most studies are limited to small sample sizes. Here are links to studies.
“Breast milk also contains polychlorinated biphenyls (PCBs)(10), a carcinogen and endocrine disruptor. In fact, by 1976, 99 percent of breast milk sampled in the U.S. contained PCBs. Approximately 25 percent of samples contained concentrations exceeding the legal limit of 2.5 parts per million. If such high concentrations were found in cow’s milk, it would be too contaminated to sell legally.(11) PCBs were banned in the U.S. in 1977, but continue to turn up in breast milk because these chemicals are so persistent in the environment. “
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