Yesterday was a rough day. Today the witness reentered the courtroom with melancholy eyes, a slow step, and his shoulders sagging from the weight of his life’s burdens. But the Government did not have to force Tony Álvarez to come to El Paso to testify against Luis Posada Carriles. He offered of his own free will, just as he did 15 years ago, when he warned Guatemalan intelligence and the FBI that Posada Carriles was involved in a terrorist conspiracy to place bombs in the most famous hotels and restaurants in Cuba.