D-IAFI worked a number of investigations in his 16 years in law enforcement, receiving 13 different commendations for his service and bravery, including one awarded for “an act involving grave personal danger.” He was successful as an undercover and an investigator in Brooklyn North Narcotics and Manhattan North Narcotics, making numerous undercover buys and was involved in hundreds of arrests and investigations. Det. Guida then worked in the South Bronx's 46th Precinct Domestic Violence Unit, where he was instrumental in improving the arrest and clearance rates as well as implementing successful criminal investigation procedures for solving domestic violence crimes. He is a Certified instructor in Criminal Investigation and instructed an international class on “Domestic Violence.”