Denmark, has a good handle on cattle and data registry.  All dairy cattle are registerd in one of three databases, and herds are classified into one of four category risks for Salmonella transmission.   As with zoonotic diseases, Salmonella  may only be transient in these cattle, but if your herd tests hot on multiple occassions, your herd classification for risk of food borne contamination goes up.  That's not something I feel that producers in the US should need to contend with.  Good management and decreasing food borne pathogens...yes.  But, allowing the government to track and control data back to the producer to assign blame NO.  It's assigning culpability, which with the etiology of these disease, is best controlled at the manufacturer level.