Rhea Seehorn and Julie Ann Emery both starred in Better Call Saul (2015).
Hair without follicles from both the father and son is submitted for testing (the barber of the former sells clippings while the latter snips his own hair, doesn't pull it out by the roots). While hair without follicles can be tested, the process is not easily available to general public. The son is shown mailing the samples into the lab in the usual manner.