I doubt distance matters. Here's a quote from the MO Dept. of Ag. site on NPIP.
"Many states, including Missouri, require either a negative pullorum test within the past 90 days or participation in the NPIP for poultry to legally enter the state or be exhibited at public exhibitions (2CSR 30-2.40). A negative pullorum test is also required for a producer to legally sell day-old poultry and hatching eggs within the state of Missouri. The Poultry Health and Improvement Program encourages participation in the NPIP with a once-a-year pullorum test and other minimal requirements for record keeping and biosecurity. Flock certification and pullorum testing services are provided by advance appointment."
So they don't have to be NPIP just have a negative test. The test is quick and simple and doesn't require participation in the program. Apparently Missouri has a history with Pullorum.
http://agriculture.mo.gov/animals/health/disease/poultry.php
I don't know how many people follow the law.
"Many states, including Missouri, require either a negative pullorum test within the past 90 days or participation in the NPIP for poultry to legally enter the state or be exhibited at public exhibitions (2CSR 30-2.40). A negative pullorum test is also required for a producer to legally sell day-old poultry and hatching eggs within the state of Missouri. The Poultry Health and Improvement Program encourages participation in the NPIP with a once-a-year pullorum test and other minimal requirements for record keeping and biosecurity. Flock certification and pullorum testing services are provided by advance appointment."
So they don't have to be NPIP just have a negative test. The test is quick and simple and doesn't require participation in the program. Apparently Missouri has a history with Pullorum.
http://agriculture.mo.gov/animals/health/disease/poultry.php
I don't know how many people follow the law.