David Aaron was quoted in "What You Need to Know About the Leaked U.S. Secret Documents," an article in ABC News, regarding the domestic intelligence breach of dozens of leaked top-secret documents.

According to David, a former top national security lawyer for the Justice Department involved in past high-profile leak investigations, a first step at this juncture is determining the potential line of custody of who would have had access to the materials posted online.

"If it's a lot of information, then sometimes that gives you an opportunity to narrow down your list because you're making a matrix with it," David said. "If it's at a relatively low level of classification or if it's operational and needs to be widely available, that gets harder to do. And if it's going into repositories that people don't have to log into with certificates that identify them specifically, then that also gets obviously harder to do."

"If photos of printed documents were posted, then you might not have to rely on the photos. You could look at who printed the document," David said.

Read the full article on ABC News.