anchor.diff:  Agency Code,Agency Name,GEOID
   AACCPSP,AACCPSP,
  -AACOPD,Anne Arundel County Police Department,
  +AACOPD,Anne Arundel County Police Department,05000US24003
   AACOSHERIFF,Anne Arundel County Sheriff's Office,
   ABERDEEN,Aberdeen Police Department,16000US2400125
   ALLEGANY,Allegany County Sheriff's Office,
   ANNAPOLIS,Annapolis Police Department,16000US2401600
  -BACOPD,Baltimore County Police Department,
  +BACOPD,Baltimore County Police Department,05000US24005
   BALTIMORE,BALTIMORE,
   BALTIMORESCHOOL,Baltimore City Schools Police,
   BALTOENVIR,Baltimore City Environmental Police,
  
positive.code: MANCHESTER,Manchester Police Department,16000US2449950
  MCPARK,Maryland-National Capital Park Police,
  MDTA,Maryland Transportation Authority Police,
  MONTGOMERY,Montgomery County Police Department,
  MONTSHERIFF,Montgomery County Sheriff's Office,
  MORNINGSIDE,Morningside Police Department,16000US2453625
  MSP,Maryland State Police,
  
negative.code: OCEANPINES,Ocean Pines Police Department,
  OXFORD,Oxford Police Department,16000US2459450
  PERRYVILLE,Perryville Police Department,16000US2461150
  PGCOPD,Prince George's County Police Department,05000US24033
  PGCOSHERIFF,Prince George's County Sheriff's Office,
  PGPARK,PGPARK,
  POCOMOKE,Pokomoke City Police Department,16000US2462475
  