For those individuals who may believe they have acquired suspected food poisoning after eating at a particular food establishment...you might wish to consider checking with your local health department. Ask to review and/or obtain copies of their health inspection reports for the restuarant in question and/or any other restuarants you may consider dining at.
(If they are unwilling to provide this info, you may want to file a request under the Freedom of Information Act). Also, ask the restuarant owner/manager to see their current health department inspection certificate(s). In most localities, these certificates are required by law to be posted in a conspicuous location at the business.
One other noteworthy item regarding food poisoning is the symptoms of it CAN occur...both in very short order or a little bit longer time frame following food consumption. (As I believe one poster stated...the very young and elderly can be particularly susceptible/sensitive to the onset symtoms & problems associated with food poisoning).
I also agree with what one poster said, (i.e. try and retain a sample of any loose stool, diarrhea, or vomitus for lab analysis). This could very well help narrow down the responsible "culprit."