Law enforcement agencies are using a mysterious new tool to unlock the cellphones of criminal suspects and access their text messages, emails and voice messages. Some agencies around the country, concerned about security, are not even acknowledging use of the devices. Adding to the secrecy surrounding the new tool, one of the companies that makes and sells the devices to police and government agencies does not display their products on the company website.

Still, the I-Team was able to get access to a device used by the Montgomery County Sheriff’s Office. Isaiah Kellar, a detective in the Special Investigations Unit, was willing to show us how it works.