In 2002, District Attorney Tierney returned to the Suffolk County District Attorney’s Office as an Assistant District Attorney, and handled more complex cases and investigations including political corruption, organized crime, street gangs, homicides, domestic violence, child abuse, and child pornography. Many of these prosecutions included long-term investigations, where District Attorney Tierney oversaw the efforts of teams of detectives, and utilized wiretaps, search warrants, grand jury investigations, and ultimately, trials.
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