Alva Review-Courier -

WASHINGTON (AP) — In the hours before his arrest, as federal authorities zeroed in and secretly accumulated evidence, Cesar Sayoc was in his element: spinning classic and Top 40 hits in a nightclub where he'd found work as a DJ.

As he entertained patrons from a dimly lit booth overlooking a stage at the Ultra Gentlemen's Club, where Halloween decorations hung in anticipation of a costume party, he could not have known that investigators that very evening were capitalizing on his own mistakes to build a case against him.

He almost certainly had no idea that lab technicians had linked DNA on two...