Carrascoso's documented professional life is rooted in Manila, the capital of the Philippines, where he practiced law and appeared before the country's courts.
The city's legal system was disrupted during the Second World War. The Battle for the Liberation of Manila in February 1945 destroyed court records, and in 1947 Carrascoso was among the parties in a Manila case that required reconstituting a lost record.
Carrascoso's legal practice is documented in Philippine court decisions from 1928 onward. In a 1928 decision of the Supreme Court of the Philippines, he served as defense counsel in a criminal action and also appeared as counsel for the defendant in a related civil action brought by the City of Manila. The Supreme Court, the highest judicial body of the Philippines, heard appeals from the lower courts in such cases, and its decisions became part of the country's legal record.
In 1936 he became the first Filipino partner of Ross, Selph & Carrascoso, a Manila law firm whose partners had previously all been American. The firm's name changed over the following decades as partners left and new partners joined; its names included Bito, Lozada, Ortega & Castillo, and the firm later operated under the name Ortega, Bacorro, Odulio, Calma & Carbonell in Metro Manila. The firm's later profile describes a general practice covering corporate and commercial transactions, intellectual property, litigation, admiralty, labor relations, and taxation.
In the postwar years Carrascoso continued to appear in major cases. In 1947 he was the plaintiff in a Manila civil case in which the defendant sought reconstitution of a record destroyed during the 1945 battle for the city, and the matter reached the Supreme Court in 1948. In 1949 the firm name Ross, Selph, Carrascoso and Janda appeared among counsel for the plaintiffs in an appeal concerning a building in Manila. In 1953 he argued his own case before the Supreme Court in a dispute over partnership assets and mining claims, in which the Court held that the judgment below was interlocutory and not appealable.
