As a magistrate, among the many investigations conducted by Casson - especially in the field of terrorism, the fight against corruption, environmental security, and the protection of workers and citizens from exposure to carcinogenic agents - are those on the Peteano massacre, disloyalty of the intelligence service and the State apparatus, terrorism and radical right-wing and international subversive organisations, global trade in warfare material, the GLADIO case, political corruption in the Veneto region, the fire of La Fenice Theatre in Venice, the trials over deaths from VCM, PVC and asbestos in Marghera, investigations into environmental pollution, disorders caused by depleted uranium and radio spectrum pollution.
As a magistrate, Casson investigated terrorism, anti-corruption, environmental security, worker/citizen protection from carcinogens, the Peteano massacre, disloyalty within intelligence services and state apparatuses, terrorism and radical right-wing/subversive groups, global warfare material trade, the GLADIO case, political corruption in Veneto, the La Fenice Theatre fire in Venice, deaths linked to VCM, PVC, and asbestos in Marghera, environmental pollution investigations, and disorders caused by depleted uranium and radio spectrum pollution.