Police all too often break the law as well as enforce it. Aaron Collington apparently is one of those officers. On June 8, Collington, a nearly 20-year veteran of the Troy, N.Y. police force, was indicted in Rensselaer County Court for third-degree larceny in connection with the disappearance of $6,200 from the bank account of the Troy Police Benevolent Association. State police allege that he diverted cash from the account and deposited the funds into his own account to cover current and back rent. Collington, now 49, who resigned his union post last September and was arrested the following month, pleaded not guilty at his June 12 arraignment.