During his time as a DEA commanding officer, he opposed the CIA in endorsing the trafficking of heroin to finance their overseas operations. Some of Castillo's habits, such as his desk always being free of paperwork and his request that anyone entering his office should knock first, were suggested by Edward James Olmos during filming. Saundra Santiago as Detective Regina "Gina" Navarro Calabrese: A fearless female detective, who after Crockett's divorce, held a brief romance with him.