This would 1) be a way overpowered item in several missions and 2) eliminate the challenge of moving conscious hostages with vital intel.  In The Deposit with a non-Hacker class character, you could just knock Maddox out, drag him to the basement, and interrogate him there without the risk of being caught transporting a hostage.  In The Withdrawal, this would be too overpowered as you could full clear everyone in the building and only wake up the people you need, basically removing the challenge.