In 2010 Metro once again announced that it would implement random bag searches, and conducted the first such searches on December 21, 2010. The searches consist of swabbing bags and packages for explosive residue, and X-raying or opening any packages which turned up positive. On the first day of searches, at least one false positive for explosives was produced, which Metro officials indicated could occur for a variety of reasons including if a passenger had recently been in contact with firearms or been to a firing range. The D.C. Bill of Rights Coalition and the Montgomery County Civil Rights Coalition circulated a petition against random bag searches, taking the position that the practice violates the Fourth Amendment to the United States Constitution and would not improve security. On January 3, 2011, Metro held a public forum for the searches at a Metro Riders' Advisory Council meeting, at which more than 50 riders spoke out, most of them in opposition to the searches. However at the meeting Metro officials called random bag inspections a "success" and claimed that few riders had complained.