Two Danbury residents have been arrested on drug related charges. Danbury Police launched an investigation into neighbor complaints of 26-year old Lucas Desouza, also known as Lucas Cole, selling drugs throughout the City. On Friday morning, investigators set up surveillance at an apartment complex on Saw Mill Road and carried out a search warrant.  Desouza was spotted entering his girlfriend's car and the home was searched.  Investigators seized a substantial quantity of prescription narcotics, fentanyl packaged for sale and several thousand dollars cash.  Desouza and his girlfriend, 27-year old Jamie Singh, were each charged with 4 counts of possession of a controlled substance, 4 counts of possession with intent to sell and 1 count of possession of drug paraphernalia.