Take in the grease trucks

You can't get a Snickers bar in NYC without passing one of those
grades posted in the front window. I usually refuse to eat in
anything below an A, knowing that even some of those dirty Chinese and
taco places get A's somehow. I have to figure that you get a B, if
the inspector literally steps in a pike of rat-shit or catches they
busboy giving the head waiter a hummer and then seeing the waiter spew
inside the mashed potatoes

But what is a bit odd, is that those street carts don't have to obey
by the same grading system. How the hell are those roving roach
motels getting away without being under the eye of those food
inspectors when there are tons of restauranteurs sweating out their
results daily