There are no regulations for serving utensils
Cross-contamination is a problem. However, utensils used in buffets aren’t swapped out every now and then. This has a huge potential for problems regarding contamination. When a serving tong, spoon, ladle, etc. is not swapped out regularly, try visiting another buffet shop.
Actual food preparation needs utensils to be swapped every four hours. In buffets, however, no regulation has been enacted to govern the use of utensils. Again, cross-contamination will flourish in this kind of situation. This also includes people who leave the comfort room without washing their hands, and go on using a single spoon for every dish there is.