At least. TX ups the penalty group somewhat when it comes to messing with a food product that is being offered for sale, but I'm not sure what lesser states do.
That's why I said 'health-specific', I'm not a lawyer, but I view it as incredibly likely that vandalism is the least they could be arrested for.
Then the lawyers take a dip into the code books and come up with this -
http://law.justia.com/codes/california/2009/hsc/110545-110655.html110545. Any food is adulterated if it bears or contains any
poisonous or deleterious substance that may render it injurious to
health of man or any other animal that may consume it. The food is
not considered adulterated if the substance is a naturally occurring
substance and if the quantity of the substance in the food does not
render it injurious to health.
-Spit/Saliva counts, as it can be a factor for disease transmission.
110625. It is unlawful for any person to adulterate any food.
http://www.weblaws.org/california/codes/ca_penal_section_382Adulterating food is a misdemeanor.
Finally: If Alaska, California, and Texas all have more or less the same rules*, I figure all 50 states probably have them.
*California's adulteration laws are an OOM larger than Alaska's, getting into the nitty-gritty with lead, wine bottles, candies, etc...