anchor.diff:  MANCHESTER,Manchester Police Department,16000US2449950
   MCPARK,Maryland-National Capital Park Police,
   MDTA,Maryland Transportation Authority Police,
  -MONTGOMERY,Montgomery County Police Department,
  +MONTGOMERY,Montgomery County Police Department,05000US24031
   MONTSHERIFF,Montgomery County Sheriff's Office,
   MORNINGSIDE,Morningside Police Department,16000US2453625
   MSP,Maryland State Police,
  
positive.code: OCEANPINES,Ocean Pines Police Department,
  OXFORD,Oxford Police Department,16000US2459450
  PERRYVILLE,Perryville Police Department,16000US2461150
  PGCOPD,Prince George's County Police Department,
  PGCOSHERIFF,Prince George's County Sheriff's Office,
  PGPARK,PGPARK,
  POCOMOKE,Pokomoke City Police Department,16000US2462475
  
negative.code: HANCOCK,Hancock Police Department,16000US2436600
  HARFORD,Harford County Sheriff's Office,
  HAVREDEGRACE,Havre De Grace Police Department,16000US2437600
  HOCPD,Howard County Police Department,05000US24027
  HURLOCK,Hurlock Police Department,16000US2441125
  HYATTSVILLE,Hyattsville City Police Department,16000US2441250
  KENT,Kent County Sheriff's Office,
  