"The implications on it are very far-reaching in terms of its ability to confirm or reject people as suspects, " Bernasconi said during an interview.

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Experts such as Mr Bernasconi and the Instituto de Pesquisa Economica Aplicada (IPEA), a Brazilian research group, have long doubted Brazil's ability to make the necessary improvements to airport capacity in time.

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Defendants tagged with old crimes based solely on DNA evidence can have difficulty marshaling exculpatory evidence, including alibi witnesses and other proof to counter accusations, recent Washington College of Law graduate Andrew Bernasconi wrote in a long article on the subject for the American University Law Review.

CNN: Indicting John Doe: When all you have is DNA