external.......and mark all the farms "no spray" on all frontages for the county guys.

(although, with respect to the 50ft----- I have noticed that the Boys get a little lax sometimes with the field cultivator and using the tape measures----which tapes are assigned to all!  LOL!)

I question whether or not the wind does not provide more drift than the buffers handle, but what makes it across the buffers has to be just so small that it cannot register.