First, through a comparison of the two methods of pasteurization and, second, through published articles concerning the dangers of unpasteurized juices. For current news stories, check out the links below. The liquid is placed in a sterilized bottle and capped, then chilled to room temperature. The cooking process lasts approximately 15 minutes at various temperatures. Although the more commonly used Flash pasteurization method is cheaper initially, it has more disadvantages.
Contaminants can enter the liquid prior to capping.
It is proven method used for for hundreds of years. From E. Coli Unpasteurized Juices and Ciders. Know What You Are Drinking.