If you wish to do some of your own tests, vs using a service, swab test kits have a reputation for being very poor quality and unreliable. This led this gal to

If you wish to do some of your own tests, vs using a service, swab test kits have a reputation for being very poor quality and unreliable. This led this gal to start a kind of one-woman crusade on the topic: https://tamararubin.com/2023/01/dont-panic-these-lead-test-kits-do-not-work-for-testing-consumer-goods-you-might-as-well-tear-up-your-money-and-throw-it-in-the-trash/ https://tamararubin.com/2023/01/dont-panic-these-lead-test-k... She recommends the american brand Scitus for swab test kits.