Samantha Raphelson

The FBI's failure to unlock the cellphone of the Texas church shooter is reigniting the debate over encryption and government access to secured communications.

Earlier this week, FBI Special Agent Christopher Combs blamed the industry standard encryption for blocking investigators' ability to crack the PIN code on the gunman's device.

Software exists to thwart a passcode, but if forced, investigators run the risk of erasing all of the phone's data. The FBI sent the Texas gunman's phone to its lab in Quantico, Va., to try to determine another method.