evidence: We have covered unsubstantiated claims that residual DNA in mRNA COVID-19 vaccines is considered "adulteration" or integrates into people’s DNA and causes cancer. Representatives from regulatory agencies and various academic experts told us there isn’t reason to believe the small amounts of residual DNA in the mRNA vaccines would integrate into a person’s cellular DNA and cause cancer. And legal experts told us that the residual DNA would not be considered adulteration. [...] With residual DNA, scientists from the U.S. Food and Drug Administration have written that they consider the primary cancer-related concern to be the introduction of DNA encoding an activated cancer-causing gene. There is no residual DNA encoding cancer-causing genes in the mRNA COVID-19 vaccines. [...] In a response sent to us for our prior article on residual DNA in the mRNA COVID-19 vaccines, an FDA spokesperson did in fact make reference to past concerns about DNA integration and cancer, while expressing confidence in the mRNA vaccines.