Health Street CEO Jared Rosenthal wants to remove the stigma around DNA testing. Mr. Rosenthal had always wanted to own a business. He sold baseball cards in seventh grade and tarred driveways in his hometown of Freehold, N.J., to help pay for college. His entrepreneurship was put on hold when he entered the corporate world, first working at Affinity Health Plan and later at Amerigroup, where he pioneered a literal interpretation of mobile marketing: using RVs at street fairs and parades to get the word out about companies. In 2010, he turned his idea into Health Street, a DNA and drug-testing business. Since then, he’s worked with about 4,000 employers and administered more than 25,000 drug and DNA tests. A urine drug test costs $75, and paternity tests run $350. Some of Health Street’s DNA tests are conducted in the vehicle; others at patients’ homes. A simple swab of the cheek is all that’s needed. Mr. Rosenthal said the Who’s Your Daddy RV idea would “never get off the ground” in a corporate environment.