You need a gate!! Any kind of gate will do, but you need a gate.
You also need a doorbell at the gate that rings in the house or to a pager. Otherwise, how are people supposed to let you know that they're there unless they come on to your property and knock on your door.
There are three signs on my gate. One reads "Sydney Acres. This is a biosecure farm. No entry without permission, AND protective clothing. NO EXCEPTIONS." The second one reads "Please ring doorbell for permission to enter. Absolutely no trespassing will be tolerated!" That one has an arrow pointing to the doorbell. The third one reads "Delivery service and neighbors, please cover shoes with protective boot covers from box." There's an arrow to the box of plastic boot covers, which is inside a little weatherproof box. My neighbors know that it's fine to put on boot covers and come to my door, and my regular delivery people know that it's fine to carry a package to a designated shed that is ~100ft inside my gate if they put on the boot covers, but they are not allowed to wheel it in on a hand truck. (One day my regular UPS guy rang the doorbell and I was in the laundry room, so I didn't hear it. A few moments later I was in my living room and heard the driveway sensor at my gate go off, so I went outside. I found the UPS guy wrapping the wheels of his hand truck with 2 protective booties each and taping them on, and the blade (base, whatever it's called) already had a plastic bag securely taped on. He apologized profusely for violating my rules, but the package was almost 100 lbs and he couldn't carry it without the hand truck, and it was marked "Rush and Urgent." He thought he could use the boot covers as wheel covers and it would be alright. I was so proud of him. Now I leave him 2 dozen eggs and a basket of whatever fruit is ripe from my garden every week in the little delivery shed.)
My gate has 2 parts. The first part is only wide enough for a really big person to walk through. It is latched but unlocked. The second part is a standard drive-through width. That part is kept locked. Local fire department, sheriff department, and ambulance all have the combination to the lock on file. My utility meters are out at the fence line, so meter readers do not have to come onto the farm. The perimeter is fenced, with "No Trespassing, Biosecure Farm." signs posted every 75 feet. If I could just get the wild birds to stop coming by, biosecurity might be a reality! I refuse to house my birds in a way that would prevent wild bird access, but I can at least control almost everything else.
Supervisors in these types of agencies have numerous supervisors over them, one agency has contracts with other agencies (NPIP, APHIS, USDA are all intermingled, both loosely and directly), poultry pathology departments at all the vet schools have very close advisory positions, and industry is very much involved in the NPIP program. Academics don't like their reputations tarnished, so they won't tolerate such a blatant violation of basic principles and will put pressure on the agency to change (or enforce) its policies. If it's not being carried out in a manner that protects industry, the big commercial broiler and egg producers will put pressure on the supervisors to modify the program. Keeping contagious disease under control in backyard flocks is essential to the economic health of industry, which is why they spend so much money on these programs. So notifying one clueless inspector's supervisor may not do anything if the supervisor is just as lazy, but alerting all supervisors agency-wide, academia-wide, and industry-wide in writing will make the problem impossible to bury, and will get a response. If not, the news media has a way of bringing poorly-managed agencies to light, especially when there's e-mail evidence everywhere and still nothing is being done. Investigative reports LOVE that!!
