(Hannibal) – While patrolling in the 2000 block of Gordon Street Friday evening, Hannibal Police observed what appeared to be a drug transaction. A foot pursuit resulted in the arrest of 31 year old Vincent Dawson of Hannibal. An investigation revealed a syringe containing what was believed to be heroin. Dawson is alleged to have taken the syringe from his jacket and thrown it on the ground during the chase. Dawson was charged with possession of a controlled substance and resisting arrest and released pending the issuing of warrants.