Professor Dershowitz attempts to bring new evidence to a case on appeal and initially gets shutdown by the judge. He states that the judge himself established that a case based on circumstantial theory only stands up if no other theory makes sense. The professor can only show a better theory by presenting it. As a result, the judge grants him permission to present new evidence.
In 1970s America, a detective works to bring down the drug empire of Frank Lucas, a heroin kingpin from Manhattan, who is smuggling the drug into the country from the Far East. Both individuals make their case on the type of support and evidence they have that will help them win the ruling.