A Danbury man who was hiding several bags of Fentanyl and crack cocaine in his underwear has been arrested.  Detectives from the Special Investigations Division were granted search warrants for 48-year old Julio Perez-Flores after weeks of investigation into illegal drug sales in the City.  The warrants were carried out yesterday as Perez-Flores sat in his vehicle.  He was uncooperative and didn't allow officers to search him. Police later located a glass crack pipe and the drugs on his person.  He was charged with 2 counts each of possession of narcotics substance with intent to sell and possession of a controlled substance and one count each of possession of drug paraphernalia and interference with a search warrant.