嘉嘉

there are a few labs out there that do food analysis
I worked at one before, if you want the contact number just let me know I can PM it to you
I don't exactly know the pricing cuz I was in the lab part
but it depends on how many tests your frd wants to do on the food
so at least few hundred dollars if you really want to do it......
or the easier way, just black list the restaurant then tell everyone, and don't go back again