They may be asked to have a test when they first register with an agency, they will shouldn't feel worried.
Have you ever heard of a company with a 100% customer satisfaction rate (outside of their particular marketing gibberish)? How long has the SEO company experienced the home business? https://www.pressadvantage.com/story/65124-alpha-therapeutics-offers-lab-tested-extra-strength-cbg-products-for-chronic-pain-and-anxiety