Wiretapping has been around since the invention of the telephone-and the government has been listening ever since. In 1928, the Supreme Court approved of wiretapping, along with using the recorded conversations as evidence. In 1945 the government takes it a step further by receiving microfilm copies of every telegram that enters and leaves the country-known as project Shamrock. In 1967, the Supreme Court overturned the 1945 ruling, and in 1968 a federal law restricts wiretapping. Shortly after Watergate, the government shuts down the Shamrock project.