i think that you can buy some anti spy device jammer

The bombs that blew up commuter trains in Spain in March 2004, as well as blasts in Bali in October 2002 and Jakarta in August 2003, all relied on cell phones to trigger explosives. It has been widely reported that a cell phone jammer thwarted an assassination attempt on Pakistani President Musharraf in December 2003. When President Bush visited London in November 2004, it was reported that British police considered using signal blocker to protect the president’s motorcade through London. During a hostage situation, police can control when and where a captor can make a phone call.

The jammer generally causes a drone to either perform a vertical controlled landing or return to its starting point – the default actions of most drones that lose communication.Those triggers would be simpler to detect, in theory, and would bring the triggermen closer to their bombs, where U.S. troops could capture or kill them.As more jammers flooded the war zone, the mess grew messier. For many months, the shortcomings in electronic warfare expertise had been evident among Army and Marine units.The US Navy owns the only operational tactical Anti Spy Device Jammer fighters in the world, but the AN/ALQ-99 pods they depend on use analog technologies, are hard to maintain, and have reliability issues. All-digital technologies and modern transmit/receive electronics offer huge leaps ahead in capability and availability, which is why the US military is working on a Next-Generation Jammer (NGJ) replacement for the pods on its tactical strike aircraft.

Cell-phone signal jammer can be used in areas where radio transmissions are dangerous, (areas with a potentially explosive atmosphere), such as chemical storage facilities or grain elevators. Swiss police were pictured this week in Davos testing anti-drone jammers, which resemble massive machine guns, as part of security preparations for the World Economic Forum. The annual gathering of members of the world’s business and political elite has brought more than 3,000 attendees to the skiing resort.Police can block phone calls during a drug raid so suspects can’t communicate outside the area.