If you modify your emissions related software, how do you know that your modifications meet or beat standards? You determine this by having someone who is qual

If you modify your emissions related software, how do you know that your modifications meet or beat standards? You determine this by having someone who is qualified, and documented to be qualified (like a certified lab) do the testing. Since a prime motivation for mods is to get more performance out of a car even at the price of 10x the pollution, it isn't surprising that many jurisdictions regulate this.