Clients are instructed not to eat before having blood tests run. how would a lab technician know if someone cheated and ate a fatty meal a few hours before having his blood drawn

It is always instructed to a patient to not eat any meal before getting your blood test because it may always interfere with the results. If you ate a meal before getting your blood drawn, your results will be high and after consulting your doctor, he would probably prescribed you medications on how to lower it. Lab technician wouldn't really know if you cheated unless they ask you if you had eaten before getting your blood drawn and if you admit it, they'll probably reschedule your blood test and explain what might be affected if you taken a meal before the test.

How do we if it is a video and they know your face.