Salmonella is everywhere, not just in raw meats. A number of kibble brands have been found to contain a high salmonella reading. This has lead to huge recalls! Simple employ basic food hygiene practises, as you would with your meats for human consumption. We have to regularly send our products for vigorous  microbiological testing. Anything with a salmonella reading would, as per regulations, have to be immediately disposed of and would NOT be allowed to go out for sale.