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Blood testing would require more of a medically trained staff. There is not as much experience needed to take a urine sample. Just follow procedures. Added cost would be passed on the the companies that have the subjects that are tested. That would end up being passed to the consumer. There is also a hair follicle test. No way to mask usage, and they can test backwards about 6 months. Not sure why there are not more tests done this way. They do not need hair from the head, for anyone that is bald. Any body hair will work.