You can get mercury from fish. Have eaten tuna fish, what about tuna fish sandwiches, or any other fish or have you handled mercury from broken thermometers. Don't know if there is a test to find out if you have mercury. I think the mercury is stored in the tissues and not in the blood so that would make it hard to detect it. It makes a lot of sense to do a detox using the biochelat, magnetic clay and you could even do the foot pads. They pull out other metals and toxins besides mercury. We all probably have some toxins and heavy metals. It's not a bad idea to try to get them out.