Two people have been as part of an ongoing drug investigation in Dedham, police said.Police arrested Richard A. Lara, of Dedham, and David DeLeon, of Boston, for trafficking heroin, distribution of heroin and distribution of fentanyl.The arrests come after a month-long investigation.Investigators said they seized more than 300 grams of heroin as well as cocaine, crack and money.More charges are expected to be filed, police said.Get the WCVB News App