A neural detention grid is an electrical net gun used by Providence agents. The weapon can shoot out a large net with four latches that are used to pin an opponent to a wall or whatever is behind them. Upon being pinned, electrical charges will travel through the net to electrocute the victim.
Beasly used this weapon when capturing the lava spitting EVO. It was also used in Basic Training when DI Hutton was teaching his students to disassemble neural detention grids. When Rex tried to disassemble the weapon, it had dropped and accidentally pinned both Rex and Noah to the wall, giving out small electrical shocks.