The recent findings of DNA fragments in the Pfizer and Moderna Covid-19 vaccines has led many to question why the FDA, which is responsible for monitoring the quality and safety of the vaccines, has failed to sound the alarm. For years, the FDA has known about the risk posed by residual DNA in vaccines. Its own guidance to industry states: "Residual DNA might be a risk to your final product because of oncogenic and/or infectivity potential. There are several potential mechanisms by which residual DNA could be oncogenic, including the integration and expression of encoded oncogenes or insertional mutagenesis following DNA integration." Put simply ... fragments of DNA left over by the manufacturing process can be incorporated into a patient's own DNA, to potentially cause cancer. A recent preprint paper ... analysed batches of the monovalent and bivalent mRNA vaccines. The authors found "the presence of billions to hundreds of billions of DNA molecules per dose in these vaccines. Using fluorometry all vaccines exceed the guidelines for residual DNA set by FDA and WHO." For the Pfizer product, the higher the level of DNA fragments found in the vaccine, the higher the rate of serious adverse events. Pfizer's vaccine used in the clinical trials (PROCESS 1) was manufactured differently to the vaccine that was injected into the wider population (PROCESS 2). This switch from PROCESS 1 to PROCESS 2 is what introduced the plasmid DNA impurities.