The number of wiretaps secured in federal criminal investigations jumped 71 percent in 2012 over the previous year, according to newly released figures.
Federal courts authorized 1,354 interception orders for wire, oral and electronic communications, up from 792 the previous year, according to the figures, released Friday by the Administrative Office of the United States Courts. There was a 5 percent increase in state and local use of wiretaps in the same period.
The office collects the figures from federal and local jurisdictions at the request of Congress, but does not interpret the statistics. There is no explanation of why the federal figures increased so much, and it is generally out of line with the number of wiretaps between 1997 and 2009, which averaged 550 annually. A large number of wiretaps was also reported in 2010, when 1,207 were secured.
A single wiretap can sweep up thousands of communications. One 30-day local wiretap in California, for instance, generated 185,268 cellular telephone interceptions, of which 12 percent were incriminating, according to the report.
The vast majority of the wiretaps in both federal and state cases were obtained as part of drug investigations, and they overwhelmingly were directed at cellphones, according to the report. Only 14 court orders were for personal residences.
Most jurisdictions limit the period of surveillance to 30 days, but extensions can be obtained. In one case, a narcotics investigation in Queens, the wiretap continued for 580 days. The longest federal wiretap was also a drug case and lasted 180 days in the Western District of Washington state, which includes Seattle.
There were 25 authorized federal wiretaps in the District in 2012, 18 in Virginia and 12 in Maryland. Local authorities in Maryland reported 50 wiretap orders issued by state judges, including 34 in Harford County. Virginia’s attorney general reported nine orders.
Officials said 3,743 people were arrested as a result of the interceptions in 2012, and so far 455 have been convicted.